hehe, yes, this bug has been found before. It is one of my favourite bugs. Don't give that hero your troops - it will go and attack you once you pass the turn. Betrayal at the tavern! Don't trust everyone you meet!
One line of missing code:
But yeah, it's a bug, it'll be fixed in update v08. Thank you for bringing it to my attention, though - and thank you for helping the development of the game :)