I said it was possible it was unexpected.I agree that it was an unexpected meeting. The perp's helmet and the rain on the roof may have even prevented him from hearing Missy until she was practically on top of him.
There is no evidence that he knew Missy or knew anything about her. If he knew her, it was a coincidence, in my opinion. (It was a rural area, so if he was a local, there's a decent chance that he and Missy had crossed paths before.)