I feel like monks would be a lot more dangerous if you couldn't basically screw them by fleeing/returning the second you see the intensify go off. It's got a huuuuuuuge downside that's ungodly easy to exploit by experienced players. If the monk's intensify lasts more than one or two rounds on you, you're either getting ganged down or doing it horribly, horribly wrong. I've seen soooooo many monks get killed because they popped intensify at a bad time and gave the opponents like a bajillion free rounds of no commands and no extra damage to beat on them.