Art, I have to side with Susan on this. Neither one's "instinct" nor initial (i.e., not over prolonged periods) observations will tell you if he is or is not someone who will be motivated to try to harm you. You won't detect a psychopath. Unless specifically trained, "experts" are correct 1 of 3 times in most studies. With specific training, most predictions barely beat a toss of a coin (51%)unless a protracted professional assessment is done. Even then, the misses are plentiful. The most accurate data is the person's history: he isn't going to tell you that in the woods.

I stick to my opinion: you are NOT going to be able to determine if he would harm you. You have to decide if you can adequately defend yourself should he attempt to do so, and if in doubt, pass him by.