Catalyst: Frost not proccing vs Broken Bones skirmish

Discovered in Daily Skirmish: Old Bones
I used Tundra Barbarians, and Catalyst: Frost didn't proc when Broken Bones (both originals and clones) attacked them.

 

You sure they weren't using Berserk Attack?

 

That might be the case

 

probably berserk attack, catalyst only triggers off basic attacks

 

This looks solved, but for the hell of it, I hit the Tundra Barbarian in Beginner Protectorate Battles with Broken Bones' basic attack, and he frosted them all to death. =(