This will be my last statement on this issue, as you aren't providing any proof to your claims while I've given you plenty of proof that there is no reset.

I sure hope you're trolling right now as your statement completely contradicts itself right now, but if you're not..Take a look at both these threads.
http://forum.square-enix.com/ffxiv/t...k-before-pulls.
http://forum.square-enix.com/ffxiv/t...ler-cast-regen

Medica II leaves regen on every party member, had there been a reset then the healers would get aggro straight away.
Either way, what I meant earlier was infact casting it after he lands, however I just took the first youtube clip I found to prove my point.
And since everyone had regen on them when titan landed, it did prove my point.

If you want any more responses then at least show some proof of your claim.