I've always had that issue with onplayertouch
I know for sure I've stood on a killbrick (onplayertouch>player>kill) with a dwand, somebody else was on it and lived, then I jumped and he died
I don't think the dwand cancels the events completely, I think only on the player holding it
also back to teleporting,
when one player is teleported, why wouldn't the other players trigger it after the first leaves?
if you're toggling it off immediately, try giving it a delay
but doesn't that only work if players are entering the zone?
yes, which is why you create the zone, making them all enter it, then killing the zone, making it so nobody else can enter it
edit: do you have a server up? I could get on and try fiddling with concepts