1: It's easier to just immediately kill the tower knights on the right tower, then kill the wizard that spawns while your sword guy takes out the sword bearer. They won't respawn until after your sword runner finishes, and the sword despawns., and everyone can get back inside the crystal room on the same side safely before the boomers respawn.
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Whatever works for your group. We ran it a fourth time tonight and didn't even bother with boomers this time. The bubble did its job well enough to not have to worry about it.