I noticed this when I checked the connection after weird things happened. I have a green bar, the enemy has green bar, but my melee doesn't deal damage nonetheless. Or I would get shot through walls, etc. Then, when I looked 1 minute later, suddenly a lot of red/yellow bars are in the game, which changed to green soon after. Repeat endlessly. Back then, I would have thought about lag switchers or MTU manipulation, however this theory nowadays supposes the existence of 3 lag switchers in any given match I play. That's simply unrealistic.