the reason is that there is a restriction on time discrepancy 2 but what about 0.5?
When one increases the game frames he can run faster making others :O but in 0.5 they can disappear and appear again making it very difficult to kill them. In jump servers they would have advantage to go through the other people(this is a benefit) and also jump easily as they have double time for reacting then others before they slip from a platform and get to ground zero!!
there must be restriction on this one too. Well I didn't wanted to hack but I found it as a BIG BUG IN THE GAME!!!!
hope this bug gets resolved
I would keep searching more bugs