Currently on Classic, grenades have 2 charges of their debuff, which allow you to deal 2 sources of damage before the effect breaks (tested with Iron Grenade followed by Scorch).
Grenades should not have a 2nd charge - they should break on the 1st source of damage dealt.
Source: Alca 3 @ 3:23 and 3:51 - no “2” is visible on the grenade debuff, nor does the debuff remain after 1 source of damage.
Vanilla WoW - Alca 3 - Elemental Mage PvP
Update: Issue was fixed with the 12/10 patch.
It’s not just grenades man tons of the break in damage CC is not breaking reliably in PvP.
I first noticed it with freezing trap not breaking instantly on damage, it’s like an entire global cool down behind roughly 4 server “batches”
As a result I can nearly kill a non plate class before the trap breaks.
It’s not just trap either, gouge, sap, blind sheep, ect. Lost nearly half my HP in a blind before in broke over a second later. This could have been easily avoided but YAY busted game mechanics.