What it does
Two cheats, one trick: playing with time. Backtrack holds back incoming packets with the opponent's position, so on the cheater's screen the opponent lingers where they were a moment ago. The cheater hits that past position after the opponent has already jumped away — reach in time instead of reach in blocks.
FakeLag works the other way round: it holds back the cheater's own packets, so opponents see them move in jerks. A stuttering target is hard to hit, and when the packets go out in a burst the cheater gets the first hit. Both fake a bad connection but switch on only in combat — duels, arenas, BedWars. The same trick in movement is Blink.
How to spot it
- Jerks and short teleports appear only in fights; the rest of the time the player moves smoothly
- Hits land after the victim has already jumped away, dropped down or turned a corner
- Ping in the tab list looks normal, yet in a brawl the player ‘lags’ worse than anyone
- After a brief freeze the cheater suddenly appears somewhere else and hits immediately
How it gets caught
The anticheat knows which target positions the client has already confirmed: the client answers marker packets in the same order it received them. If a hit only matches a position older than the one the client must already have seen, or the replies stall exactly when an opponent is close, that's packets being held back, not the network.
An honest player's bad connection looks similar, but it affects every packet and every moment, not just the seconds of a fight. So Backtrack and FakeLag are caught by accumulation: delays that line up with combat again and again are evidence; a single dip isn't.