I got stuck on normal Titan because of a lot of bad and some lag. After a bit I started messing around and found that it is possible to run into his ability before he is done casting and not get hit by it while people outside of the ability path get hit by it.

It isn't just Titan that does this but its very obvious since you die when you get hit. The dragon in the goblin instance was hitting me the other night while I was way out of ability range and my entire party saw that I wasn't in it but still getting hit.