Yeah, Bexan has never met other werewolves... that's the whole point of his wanting to go to Siberia. That'probably why he couldn't tell that the other guy was like him. Either no one told him what to pay attention to (smell or whatever) or like the other poster's said, he's had so little practice that his senses are a bit rusty.
We don't know if werewolves smell like dogs when they're in human form. Bexan probably had been adopted by a human woman, since he said he has never seen an other person like him.
So it was pretty clear the attacker was like Bexan. But why couldn't Bexan smell what he was?
And it's either a play of dominance or the other guy doesn't like Bexan's publicity, why he attacked Bexan? And love the priority being the car lol.