You can release jutsu before you get hit and after you get hit, but once you get hit, the entire damage process takes place.
(Jūken: Jūho Sōshiken) - Gentle Fist: Gentle Step Twin Lion Fists
Type: Offensive/Supplementary
Rank: S
Range: Short-Mid
Chakra: 20
Damage: 40 (+20 to Taijutsu/+30 to Gentle Fist)
Description: The user exudes chakra from both hands and by utilizing advanced chakra control, mold the chakra into a form highly reminiscent of large guardian lion-shaped shrouds to greatly increase both the range and destructive power of their taijutsu. These lion-shaped shrouds are able drain the chakra network of those they touch and can be used in conjunction with any of the Eight Trigrams Sixty-Four Palms variants, increasing the damage by 30 while sacrificing the ability to limit chakra usage. But that being said, it is quite difficult to achieve this move and even a minute error with regards to chakra control will result in failure.
Note: Lasts up to three turns per use and has a three-turn cooldown.