Handy! Anything that makes them hesitate in their aim is of use.

Also: River is not hesitating to aim them at each other, when the opportunity presents itself. Either in throws, or in helping a blow (or, twice, a bullet) to swing wide.

However, this is a big room with a couple of exits, and River and Duo are only two people against close to 30 opponents. Not everyone is sticking around to fight.