I agree that the urine smell could very well be unrelated. I actually noticed two separate places where metal piping, the kind you might see inside a storm drain, crossed the path. Possibly somehow the smell was related to that? I also noticed a good bit of water was on the trail at places as a result of rainfall lately. It was a very damp trail at times. With all of the tree cover, the smell could be from the water. But I was stopped in my tracks at how strong it was just prior to our encounter.