What the actual fuck. I mean, really? He ripped his arm off while doing some friendly stretching? What is that guy's body made of? Rotten wood? I mean, even if they're powerful, it should hardly be to the extent of pulling someones arm RIGHT OFF AT THE SHOULDER JOINT by mistake. Even if it was a strong species, it'd have to pull with all its strength to get an effect like that and it wouldn't just pop off without pain and indication that he put too much strength in.
I'm just not buying it. Too ridiculous and weird. Haah... Should've just made him break or fracture the bone by mistake, that would be far more believable. It's not as if the guy he pulled was an animal with very thin limbs.
Also, not really a surprise at all that the bear did it.
By the way, what's ordinary about this day?