If the second half of your post was directed towards me, then what I meant was that during the first phase (prior to his first jump), Medica 1 is enough to keep people alive. After the heart phase, you should throw 1 Medica II preferably right before the stomps and then cast Medica 1 during the stops. If you get enmity problems, just use shroud. Using shroud 2 times during the fight should be enough to make sure that you'll never get aggro, depends on the tank as well of course.
Normally, using shroud just once will be enough to keep you safe during the whole fight, later on you'll probably just use it for the MP instead :)
http://www.youtube.com/watch?v=WMsWJmXSdZ0
Notice how Medica II was used prior to the jump and everyone had the HoT on them.
Had there been a reset then Titan wouldn't have gone straight for the tank.
I've been running Titan tons of times to get FC members their Relic weapons, I'm 100% certain that there is no reset.
Also, pay attention to what he says during the video in phase 1. They are doing it so that the tank can build up enough hate, so that healers wont have the problem of over-aggroing later on. Strange thing to do during phase 1 if there was a threat reset, wouldn't you say? :P
Also, forgot to address this one.
"Please show me one other instance where mid battle, ONE Medica II pulls aggro."
That have never happened to me, not even in the Titan fight.
