Whenever we got close to a door, we warped. (I'll be using a situation similiar to what happened, as I'm not exactly sure as to what the order was, or who did it)
In one case (I'll be using B, B(1), CG, and PC):
B and B(1) were at door 2, CG and PC were at door 1
B went close to door 2, and warped the farthest player, PC, to door 2
CG, wondering what had just happened walked towards where his teammate had dissappeared (door 1), warping B to door door one
PC moves towards door 2, warping CG to door 2
B moves towards door 1, warping B(1)
In each case, after being warped, you warp to behind the target: On a 'graph line' measuring the distance between the two doors as '0-1-2-3-4-5-6', B is measured at 1, CG at 2, and B(1) at 5. When B moves to measurement 6, he warps the farthest player B(1) behind him to measurement 5.
This is how every player was warped, instead of the same person just being warped back and forth =)