10 Mar 2006 at 22:25 - 7
Perhaps he hit you and swtiched targets and that person moved? I am not sure that the targeting portion is always correct, but I haven't had problems, or rather, extended problems, with the wurm as long as no one moved.
This is always more difficult however if you happen to trigger the wrum while you are still fighting the craps and have to move to avoid them.
That usually becomes the run away time. One time had just a guildie monk and myself left after we ran all the way back to the beginning and the wurm was still chasing us. We held still, she kept me healed and protected and I just nuked the hell out of it, then we went back and res'd.