I agree tri-disaster's point in solo, but in instances especially with paladin, you really don't need to readjust position assuming paladin uses flash. But yes tri-disaster is useful to make mob stay in same place. I would normally would cast tri-disaster (if i do) after all dots spread on mob, meaning after Bane. I see that Bane breaks bind since one of the DoT apply initial damage. (I may be wrong on this, will test again).