It borders on the TSTL character–Too Stupid To Live–
Something that might mitigate that is if she recognized him sooner. Going after a stranger in the dark may not make sense, but approaching someone you know to find out why the hell they’re in your yard after years of absence would. That might take some of the tension out, though…
Or you could show him try to get away and slip on something, thus hitting his head on the rock. That would be an action instead of description/telling. And it would give her a nice little dilemma: Help out like a good human or leave him lying there and let the paramedics/cops deal with it?
Just my two-bits. Never know if it helps if you don’t share, right?
Author of Renn and The Springfield Chronicles