My provocative theory on what really happened (spoilers)
Is it just me, or does it seem like the creepy Irish woodsman planned this whole thing out? He seemed to be a very competent woodsman, perhaps enough so that he could make friends with and train the bear.
I believe he caught an eyefull of Missy's character naked when she and her boyfriend went swimming in the nude. Then he was like "mmm, I wanna git me some of that!"
So then he follows them and arranges the meeting at their camp, and tries to establish dominance over the boyfriend. Even going so far as to mark his territory right in front of them.
While at the camp, he cleverly gets the scents of both Missy and her boyfriend. Hers from the panties he picked up, and his maybe some other way during the evening. I don't remember if they shook hands, but he'd have found an opportunity I'm sure.
So then, he goes back to his bear friend and instructs it on what to do, using their individual scents. He and the bear then stalk the couple thru the woods, and when the time is right the bear takes the boyfriend out of the picture. Sure, he injures Missy as well, but just enough to make her more needy for his help. It easily could've killed her as well.
Then, of course, he goes back to the lodge to organize the rescue. He already knows pretty well where to find her, so his hero-hood is all but assured. Once rescued by this highly competent woodsman, and on the rebound from the traumatic loss of her totally stupid and inadequate boyfriend, she will be ripe for the safety and security he can provide her. He's gonna score for sure!
Don't find this plausible? Well then answer me why he had caught like 20lbs of fish? Could it be, ladies and gentlemen, that most of those fish were originally intended for bear training purposes?
Any reasonable person would have to accept it to be a real possibility.