Let's talk about regen :)

[Fort]

This is a classic healer killer move when he's got a HoT up before the tank pulls. It has been this way in every MMO. There's a few things you can't do as a healer, and one of those is pre HoT'ing.
Whether you mean to or not, you need to let the tank know (as some players either might not realize it is active, or they don't realize the dangers of it) that your HoT is still up.
However, in some games, such as FFXIV. The player can cancel their active buffs. So just communicate with your tank, and have him cancel the regen before he pulls.
My MT for my FC already knows the drill. Any new tanks I just simply say, "cancel regen before pulls please" and it seems to work fine.

[Astrolia]

It has been this way in every MMO. There's a few things you can't do as a healer, and one of those is pre HoT'ing.

Really? I lol'd.