Barbara crept around further from where the thunderstone impacted, carefully sanning the dwarf and half orc on the quayside for any sign of ranged weapons on either of thier sides. Then scampered up vertically looking for some ledge or outcropping that would give leess than a foot of room to manuever to the thugs, denying them any easy pursuit and balaning the odds should they chase her.

With such a position found, she weighs her odds, deciding she has time to defeat the two up here in detail. Thus she instead fires her own crossbow towards the crossbowman on the ship.

Spoiler: Rolls
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(1d20+6)[18] for (1d8)[2]+(1d6)[1]