Gray: Well Well....... allow me to showcase my skills.
As Gray Notices the weird position of the sword in Saito's hand he quickly starts to glare towards you in out most consciousness, he notices that the hilt is now pointing towards him and going by the slight diagonal position of the sword in which the tip of the blade is pointing towards the ground he concludes that it will most likely be an upwards thrust attack due to the holding stance but making no prior assumptions Gray stays on a Guard while he notices a chakra charge being built on Saito's Leg.
Gray[Thinking]: Damn he is going to strike head on........ and with his improved speed it will be hard like hell.
A split second later Gray see's Saito charging right towards him so without wasting and time Gray slides his left leg outwards in the left hand side and thus widening the space between his leg's and gray now stays on his feet to quickly hop and spin around if needed to, Gray also passes his chakra throughout his body to keep up with your fast movements, and the moment you get with in striking range of me I see you thrusting your right arm upwards with intentions to strike me with the hilt of your sword.
Gray: Just as I thought.
Gray without wasting any time spin towards his left using a thrust from his right leg and he thus successfully avoid your initial strike, now as he in now on your left hand side and you are looking towards the front gives Gray the perfect striking chance and without waiting and time he swings his sword in synchronization with his spin to cut through your stomach but he does not fully slide through you internal organs so as to keep you alive but severely wounds you.