i tank the bats as a brewmaster. it wasn't always pretty and i died more then a few times, but it requires good positioning when kicking turtles thru the bats to burn them quickly. outside stuns are extremely helpful around the time the quake hits if your stun isnt available.
we tried the kiting strat and it was working well. but we ended up need more damage on the boss, so we reverted to tanking the bats next to tortos for the cleave dmg from the high vengence. just rotating outside cds when personal cds weren't avail is what we did.