Damage/ability detection is bugged, had a corki jump evade my blitz q into MF ult and he took 0Dmg!!

in a game i was blitz i run in and Q at corki but he jumps of to the left into my team mate MF's ult, he then proceeded to move out of it <from the mid of it> taking th long route out all the while taking no dmg from it at all......