Minecraft wiki entry for Player_versus_Player, associated text: Despite lag making people randomly visually act, cause injury because of damage just showing up, and crash the server, it may still be useful instead of a nuisance if you know how to control it to your advantage. Whenever you hit someone under the effects of a lag spike, there is a chance that they won't be hurt and can escape. You can use this time to run when a lag spike comes, therefore you may escape if necessary. Keep in mind, lag also delays redstone machinery, meaning if there's a staircase that only activates when you're on a pressure plate, you can get up easier.