Immobilization
Not sure if this could have been caused by someone hacking either. I noticed during a match a ranger was teleporting randomly. I downed the ranger before, and it wouldn’t let me attack him. About 5 seconds later he teleported to a side, away from where he went down. Also, in the next match I triggered traps that had no animation below my feet, but I saw traps triggered by no player to the far left of me.
Both of those sound like you high a pretty bad lagspike. Even more likely if you saw the skill icons you were trying to activate “pulsing”. I don’t do sPvP but I experience things that fits your description almost perfectly whenever my connection is acting up(it can be really crappy with rain).