I think I just witnessed someone hacking

Jun 11, 2015
Player: Lucas826

I just witnessed a player jump up further than should possible to get to the end of a parkour map, I watched him do this for a few checkpoints before I started taking pictures, this is the last jump I watched him do, I basically spammed my F2 key taking as many pictures as possible to capture as much movement possible, to show that the player really did infact jump up against the block and get ontop. I'm not sure how he did this, but it's some sort of glitch and or hack.