Caliban follows up his surprise attack with more gauntleted punches to the green hobgoblin's face.

Spoiler: Combat
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Standard action: Flurry Strike the green hobgob.
Move action: If he drops, Caliban moves away from the remaining hobgoblin and points his bow in their direction.

Punch 1: (1d20+5)[25], (2d6+5)[12]
Punch 2: (1d20+5)[13], (2d6+5)[15]