Try take a shot -- why not?

You're all done, you may as well lend a helping hand -- especially since you've got a ranged weapon, and aren't really in any risk firing it.

You lift your pepperbox and look down its barrels, closing one eye and sticking your tongue out from the corner of your mouth. You don't want to miss, and since you don't really have a time limit and the monster's torso is staying pretty still, you've got plenty of time to line your shot up.....

BANG! You fire off an impact bullet, which bounces harmlessly off of the monster's flank chitin. Delilah flashes a glare over to you, before getting back in the fight and catching another scythe strike with her sickles.