Two Questions: How does Defense work with Darth Revan's Ferocity debuff? and Negative Defense?

"Juzz;c-1827025" wrote:
As with other stats, defense cannot be lower than 0.
So after 7 stacks, defense gets to 0 and any additional stacks would do nothing as it is already 0

"Eterz;d-200569" wrote:
Hi all!

As the title says, my question is: How does Defense work with Darth Revan's Ferocity debuff.

I'm asking since I cannot find any answer what happens to the defense percentage when at 10 stacks or more the defense stat should be at -150%. But when I have met Team DRevan (DRevan, Badstila, HK-47 plus two other toons) in Squad Arena I haven't noticed doing more damage against them. So at 10 stacks or more of Ferocity what happens exactly

So what is happening with defense? is it at 0% or can one have negative defense?
I'm asking since I haven't found any answers about either negative defense (-1% or more) Ferocity and defense.

Cheers
Eterz