The stun grenades emit smoke over their area, making it harder for everyone on both sides to see each other. It's outside, so nobody is getting choked by the smoke.

Bart keeps his dogs close as he fires his shotgun into the smoky and stunned enemy forces. He hits, and kills his target.

TURN 2

Sean sees a lot of smoke in the outpost.

(OC: smoke gives an -4 penalty to attack rolls.)