Bjorn took a swing, but he could see that his axe didn't do as much damage as he had hoped it would. He had one option he might use. Dropping his axe, he drew his silver dagger, gritting his teeth against the cold of it, took a step to the side and tried to hit the little imp there.

Spoiler: OOC rolls and actions
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free action: drop axe
move action: draw dagger
free action: 5 ft step (to W19)
attack to imp X18: (1d20+5)[22]
damage: (1d4+3)[5]