In some fps games, you fudge your connection to make yourself lag (i dont know how). This means you effect another player i.e your opponent causing them problems, ie they shoot you but youre not actually there or youve moved. It can give you the appearance of a smaller profile to hit. It effects hit detection etc. I dont know the nuts and bolts of it, but Ive encountered players using this tactic and they can be problematic to hit. I put 3 shotgun shells in someones head from point blank as he kneeled facing the other way, yet he knifed me the very next instant. Thats my most graphic experience of it. But it happens quite a lot. They get kicked mostly by the admins.
ESL, ah proper competitive environment. I note the distinction and understand now what you mean that we are not in a proper competitive environment.