This is probably far less strange than adventures occasionally staying awake for weeks at a time and fighting/running around all the while, or NPCs that never move or sleep and always say the same thing. I don't think he was being hostile, there's some things you just can't really explain in game that happen simply because you're playing a videogame. (Well, you could. But your game would wind up with an incredibly bizarre world and would likely feel like a parody.)