Countering Frozen Blast in PvP?

Being able to freeze an opponent for 20+ seconds, rendering them unable to defend themselves from multiple smashes AND dealing increased damage seems very powerful. What are the best ways to counter it?

Without the use of pets? none. You're frozen? welp, you're screwed.

Doesn't Berserk negate freezing?

It does if you use it before they freeze you but I'm not sure you can use berserk to break out of it since I never tried. I know, however, that using berserk does not free you from a spider trap...