I'm sorry....I admit that I laughed....
Danny and Sunnie will both do this on occasion if I'm not fast enough with a leash pull. (yes, Sunnie is a leg-lifter)
We've also had pee on the head of one who sniffs at an inopportune moment.
I'd just try to keep it from happening...move/speak fast...unless he starts to pee on her when she isn't already peeing herself. Right now, it doesn't sound as if it's deliberately aimed at her.