Assuming both empower buff and soul harvest buff active, and assuming 1.7 crit modifier and only 10% armor mitigation, you need a 11k tooltip surprise attack. Sure its possible if your defences are complete *** and the enemy stacks all that. And you can get even higher.
While surprise attack does good dmg, its nowhere 8k base dmg in pvp. That would require 16k tooltip and 0 armor target
You're telling me you have never been hit by a 8k surprise attack....?
I've been hit by 12k surprise attack, non-emp, non-stealth.
being able to hit for 12k or having a 8k base damge are two different things. my highest SA was a bit above 16k. none the less my avarage is around 6,5k with <5k uncritted and upto 8,5k crit hits. and some monster hits every now and than (<1% of my attacks) with 12k+ dmg.