Titan HM has a soft enrage, not a hard, last I checked. If you don't down him in a certain time, then he'll start doing more and more tumults up until you kill him or wipe. I remember one time way back in early 2.x being the only dps alive from the heart phase on as a mnk with a pld and a whm. When we finally wiped, Titan was doing 12 tumults(stomps).