It's simple, you came out of the trees onto a run closed for grooming, and it was late. It's not a coincidence, you just didn't know where you were when you went off the trail and you wound up on a closed run. It doesn't seem like the patroller cared about you being in the trees, he just cared about you getting taken out by most likely cracked out keystone groomer.
Talk shit on ski patrol all you want, most of the keystone ones are actually really good guys. Plus no matter what those guys will save your ass anytime.