Donna doesn't fight her. This has already been a fight. She's not sure Callisto is even going to know how to undo the safety. Even when she figures it out, it's going to be challenging. Those things always are.

"Come over here." Donna gathers the bottles and uncorks them so she can stuff the rags down, letting them soak for a bit. "You're gonna need to press and hold that down while you pull the trigger. It can be tricky. You might want to use both hands.