Originally Posted by
Ghosty
When the Pylon is about to fall melee is backed away or off killing a mind trap while the tank is positioning the boss under the pylon. Now if Soa puts the tank into the mind trap early enough it's not a problem, but if he does it a few seconds before the pylon drops on him, he moves out from under the pylon and there is not enough time to reposition before the pylon falls, basically meaning it's a wipe. It's basically just bad RNG, unless you want to take the chance of having a melee dps (since you generally don't run 2 tanks on Soa HM or NM else you run into problems with the enrage) with a taunt getting hit with pylon damage along with the tank for each and every pylon. The chances are higher that you would eventually lose the dpser, than the chance of having your tank thrown in the mind trap at the exact wrong moment.
Bioware just needs to polish their encounter design just a bit to prevent things like this from happening at critical moments.