Well, since I have only up to C -Rank in Katon and D/ C - Rank in fuuton, I would use natural means to get out of this combination assault.
(Not using RP'ing description, just a simple explanation ) I would first pull out a kunai as we are both staring at each others eyes expecting combat. Then as the first kunai approaches I would parry it away which would look like this...
But now doing this would place me in the genjutsu, so as the snakes erupt and begin to coil around my legs,(which would force me to look down as the constriction sensation begins.) But as I see the snakes the second kunai would have hit the floor and black smoke would instantly engulf the area around my legs. Therefore, I could use the easy route and say as I see the smoke erupt I notice it goes through the snakes but, that isn't much fun. So what I would do, is with the kunai still in my hand I would do one swift hack along the sides of my legs, which would graze the surface layer of my thigh as I intended to stab down at the snake and flick it off. While the smoke surrounding me and rising, I would expect to connect with the snakes flesh but instead I would feel nothing. So as I graze my skin and the constriction sensation begins I would then in a panic bite a chunk of my lip off releasing me from the genjutsu. My mouth would then fill up with blood and with my free hand I would quickly put my index and middle finger in my mouth covering them in blood. Then with a swift fluid like motion I run the my bloodied finger across the side of my face. Then as the wind and smoke combination comes at me, I would release a powerful blast of wind filled with leeches to overpower the blast. The leeches would be protected by their own chakra so the impact wound't harm them, plus the smoke bombed wind would now also conceal them, turning the opponents jutsu against him. Now the seemingly effective jutsu will be counteracted and with his wind and smoke being the medium in which I use it to capitalise. He will have literally almost no time to react/ negate it. The leeches will cling to his face and upper torso and begin viciously syphoning his chakra. This will prevent him from using the third attack in the manner it was originally intended to be used in and it would also leaving me ample time to now attack and gain even more advantage with my remaining two jutsus if I wish to do so.
(Not using RP'ing description, just a simple explanation ) I would first pull out a kunai as we are both staring at each others eyes expecting combat. Then as the first kunai approaches I would parry it away which would look like this...
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But now doing this would place me in the genjutsu, so as the snakes erupt and begin to coil around my legs,(which would force me to look down as the constriction sensation begins.) But as I see the snakes the second kunai would have hit the floor and black smoke would instantly engulf the area around my legs. Therefore, I could use the easy route and say as I see the smoke erupt I notice it goes through the snakes but, that isn't much fun. So what I would do, is with the kunai still in my hand I would do one swift hack along the sides of my legs, which would graze the surface layer of my thigh as I intended to stab down at the snake and flick it off. While the smoke surrounding me and rising, I would expect to connect with the snakes flesh but instead I would feel nothing. So as I graze my skin and the constriction sensation begins I would then in a panic bite a chunk of my lip off releasing me from the genjutsu. My mouth would then fill up with blood and with my free hand I would quickly put my index and middle finger in my mouth covering them in blood. Then with a swift fluid like motion I run the my bloodied finger across the side of my face. Then as the wind and smoke combination comes at me, I would release a powerful blast of wind filled with leeches to overpower the blast. The leeches would be protected by their own chakra so the impact wound't harm them, plus the smoke bombed wind would now also conceal them, turning the opponents jutsu against him. Now the seemingly effective jutsu will be counteracted and with his wind and smoke being the medium in which I use it to capitalise. He will have literally almost no time to react/ negate it. The leeches will cling to his face and upper torso and begin viciously syphoning his chakra. This will prevent him from using the third attack in the manner it was originally intended to be used in and it would also leaving me ample time to now attack and gain even more advantage with my remaining two jutsus if I wish to do so.
Leech Style: Leech Fly (Hiru: Hiru Hae)
Rank: A
Type: Attack/Supplementary
Range: Short-Mid
Chakra Cost: 30
Damage Points: 60
Description: The user puts blood on their face or arm and makes the hand seals for summoning. Then concentrates his wind chakra in his mouth or hand. Finally he shoots a wind blast from his mouth or hand that has between 50-75 normal size leeches inside that has coat themselves in their own chakra to protect themselves while inside the wind. Once the wind hits the opponent the leeches starts to suck on the opponent's chakra.
-Due to wind blast leeches in the wind will be vulnerable to a fire based attack
-Must have signed Ninja Leech scroll
-Only used by Deidara Nara and Mugiwara
-Only use three times per battle
-No Wind jutsus and Ninja Leech summons, A rank and up the next turn
Rank: A
Type: Attack/Supplementary
Range: Short-Mid
Chakra Cost: 30
Damage Points: 60
Description: The user puts blood on their face or arm and makes the hand seals for summoning. Then concentrates his wind chakra in his mouth or hand. Finally he shoots a wind blast from his mouth or hand that has between 50-75 normal size leeches inside that has coat themselves in their own chakra to protect themselves while inside the wind. Once the wind hits the opponent the leeches starts to suck on the opponent's chakra.
-Due to wind blast leeches in the wind will be vulnerable to a fire based attack
-Must have signed Ninja Leech scroll
-Only used by Deidara Nara and Mugiwara
-Only use three times per battle
-No Wind jutsus and Ninja Leech summons, A rank and up the next turn
The first one shocked me enough.. It was an Internet error that I couldn't fix in time.. To be honest, I originally wanted to go through my whole time here never getting one... 
But that didn't happen but it's ok because I know, I won't get another one.. Don't worry about it sensei...