Ashamane's Frenzy

In fact, the dot has actually 10.5 sec duration for 175% of the tooltip dot damage.

Every direct damage strike of this spell deal very low damage but REFRESH the duration. Refreshing a dot can increase his base duration by 25%. (7.5 sec here instead of 6 sec)
But the direct damage refresh the dot at max duration EVERY 0.2 sec during 3 sec.

You can use other abilities during the 3 sec of direct strikes.
Just make sure the target is in front of you and not out of range during the 3 sec of direct strikes.

EDIT : You need to land the 15 direct strikes or the damage will be lower than the tooltip damage. Seems to stack in a strange way.

Total damage in fact : 300% AP + 1575% AP (and not 300% + 900% according to tooltip)

Note : You CAN'T apply this dot on multiple targets, it will continue to channel on the first target even if you attack something else meanwhile.

The devs told us exactly how Feral abilities work in PvP at the link(s) below.

http://us.battle.net/wow/en/forum/topic/20747314610#2

I'm pasting it here as they typically delete the beta forums after release.

Ashamane's Frenzy deals 50% damage in PvP

Does using another ability while doing this interrupt it, or does it continue? Is it channeled or fire and forget, I guess I'm asking.