Wanted to chime in that this exact issue I wanted to report. The clarify the problem happens even if you don't actually pull them, just attaching the beam is enough to mess with teammates. Any sort of movement seems to be tethered. I think the reason it feels inconsistent is that it has a tether effect like Vindicta's leash and the leash distance is based on your initial distance to the target. So if you start far and they roll towards you they won't experience any problems but if they try to move, roll, jump, etc. outside of the tether range it stops them.