At the throwing of vash's dagger the three other crossbows quickly come up and fire at him, along with the one he threw the dagger at.
Spoiler
(1d20+4)[17]
(1d20+4)[15]
(1d20+4)[11]
(1d20+4)[20]
Three bolts hit him, two hitting his arms, another stabs into his stomach.
Vash:
Spoileryou take 16 damage, i rolled it off screen for ease.