Well if his ability is "can't be lynched" that's something he wouldn't want the wolves to know. So we still have to wait to see. The last time I played a game where a lynch failed it was a role called a "mafia lawyer" who picked someone to protect from a lynch. But this could be a play on that if someone else is pulling the strings. It could even be a villager's power to prevent a lynch. Or it could simply be that Rowain is an unlynchable villager. I agree that it seems unlikely that a wolf would be unlynchable, unless there were only 5 wolves? Guess we just have to wait for Rowain.
“The wind went mute and the trees in the forest stood still. It was time for the last tale.”