Lag or Speed Hack
It’s a speed hack. You can tell by them appearing to “lag”.
If they suddenly jump forward a few meters, then this is because your client assumes they move with regular speed (and extrapolates their position of base of that), but they modified the speed in their client (and on the server), so their real position differs from what your client assumes. When the server synchronizes positions again, the position is corrected.
Funny fact about speed hacks: If they die while the position is not synchronized, your WON’T be able to resurrect them because you have no idea where their corpse actually is. If you try to rezz at the position where you see the corpse, nothing will happen because it isn’t there.
stuffs
These things always happen to me when the game starts to lag. My friends have witnessed countless times when I “teleport” around from one place to another, and when I get rezzed but stood up at a place far away from my originally downed location. Being a ranger, I could tell where the game made me going(usually a corner of a room or some wall or cliff side) because my pet will follows where my character is actually going, and where I actually am client-side wise(because I can still control my character, just that the game won’t respond). So your claim isn’t all believable for me.