Zalmarath, the Colossus Bug

When the boss dies during his laser phase, it bugs out, causing the lasers to remain even after the boss dies. The game crashes if remaining in the instance after a couple of minutes, probably due to a memory leak.

EDIT 1: After trying to relog, the game crashes. Will probably not be able to login until the instance auto resets.

EDIT 2: Was able to login 30 minutes later.