In T4 spiders, what i usually do is go from full to zero spamming flash, then i start spamming riot blade comboed to refresh mana for next phase. I use another flash or two before the end of the phase depending on blm hate, and CoS when available obviously. Pretty simple.

That being said, any blm that goes nuts right away with flare is going to rip the hate off the tank faster than you can shout "NOOB". Any melee dps that decided he had a personnal grudge against that one particular spider is going to do the same. In both case though, it's on them, not on the tank.