Simple tip: when that fire super saiyen thing is around Giles, don't under estimate the range of the bug debuff. Click back, don't press backwards. There will also be at times when the tank doesn't get hit with it, even if the tank is in the center of it.
Also, the healers + tank should time well enough to get rid of Roar pretty easily.
The biggest annoyance is if the tank pulls too far away without walking back, or someone gets hit with roar, it heals. That, and when random people in Golden Plains "try" to help and get hit with roar, and heals it, either because they didn't realize it or theyre being *******s. Sigh.