Wherever Barrow's mind is in all this, it's fair to say he's not overly concerned about harming either assailant-- and in fact, it's far more likely to assume he thinks he's being killed, which only results in a redoubling of effort to not be.

It's thanks to Abby's attention and his attempt to throw her that Barrow is only able to manage one hand at Lazar's throat; aside from that, it's not a sustainable position, straddling one while swatting at the other. He loses his balance, falling onto his side and nearly rolling onto Abby, who instead is treated to the leg of an infirmary bed against whatever part of her is closest to it.

His mouth bleeding from the sharp wood, Barrow spits a splinter and flounders to get up.