If you don't already know
- "Enforce Execution" is an Counter attack skill

This is what i use on T1-T2 and early T3
- the build help a lot if u got low Crit

if your team need more Stagger!

-Change AT02 Grenade
3-1-1
FireWork with "Overwhelm runes"

if need more
________________________________________
Meteor Stream with "Galewind runes" - for the cast speed

3-3-1
"Bombardment support"

But Just AT02 and Whirlwind nade should be enough