Riddle Me This: "Regen on pulls is bad"

[tinythinker]

@OP: Based on what you said, you were fine. You just need to change the order of your opener a little. Start with Aero, then a cure, then regen. This gives the tank two GCD's of enmity generation before you've thrown out your regen.

Thanks.

And while I get the message "Regen will pull aggro off of a tank who is in the process of pulling", more info could help as I don't know the hate rules yet, which a healer needs to understand every bit as well as a tank to do their job properly. So to be clear:

-Enmity builds over time; taunts/damage from tank build it but it can take time to accrue; healing can cause it & also accrue it over time; HoT from Regen on tank before a pull can outcompete what some tanks pull with for enmity?

-I mostly use Shroud for mana regen in boss fights or really big pulls because of the long cool-down, but is it worth it on regular trash pulls for keeping my enmity lower while I use my healing stick?