For the next round, assuming a distance of two yards between the monsters and Bain (waiting for the creatures to approach the defensive line, if they have not moved). He will deliver a DWA attack, going for the vitals and a headshot.
Attack 1:
Shooting 15 (DWA, acc, vitals: 15, 3, -3,), successful.
Hide: 3D6 → 15(6 +4 +5)
Damage:
2d6+4 * 3 IMP
Hide: 2D6 → 7(3 +4)
Injury: Up to 33 HP of damage.
Attack 2:
Fast-Draw (14) and Ready (9) successful.
Shooting 10 (DWA, acc, skull, quick-shooting: 15, 3, -7, -1), successful.
Hide: 3D6 → 10(2 +2 +6)
Damage:
2d6+4 * 4 IMP
Hide: 2D6 → 2(1 +1)
Injury: Up to 20 HP of damage.
Given the hit locations, one HT roll is at -5 and the other is at -10.