Stand in the middle. Theres a delay between the beam on the ground, and the actual attack itself. So if you need to pinch off a heal, do it. Shroud isn't going to help you. If you're really having a problem, put regen on people. Or stone skin yourself prior to that phase, so if you have to take a hit, you can. I suggest swift cast for the last ship phase. Generally there are a few bits up and the screen gets hard to see at that point. So SC a medica 2 or whatever is needed.