Seeing his comrades ready to act, Bartleby readies an action, poised to strike upward in an upright slice, if any of the stirges come within reach of his blade.
[If any does, he rolls 1d20+4= 17; assuming that's a hit, it will be for 1d6+3=9 (!) points damage.]
[If any does, he rolls 1d20+4= 17; assuming that's a hit, it will be for 1d6+3=9 (!) points damage.]