Killing the dude is clearly at the bottom of the priority list. He ain't getting anywhere fast to begin with, saving the girls was the obvious first choice, then 180 and offing the guy easy. Now with this he also has to perform emergency medical assistance, which could go off better if he saves the other girls and gets their assistance to do so, but that's going to cause some problems too.
If he can shove her into his carrying space, probably quickly save her, put her into that space and carry her to then save the girls and then perform the emergency first aid and then off the guy. Not impossible for him I imagine, but definitely straining.