OK, this came up at the tournament and just wanted to see what the collected wisdom of the forums thought.

So, the general consensus of opinion was that Mindstrike hitting the squad would cause the leader (if it has one), or a randomized guy (if there's no leader in the squad or the leader is dead) to suffer perils of the warp. But only the one person would suffer perils due to the Brotherhood of Psykers rule. The question is, what happens if the squad suffers, say, 4 Mindstrike missile hits. Does the one guy suffer perils 4 times, or does it progressively move through the squad?