Looks like Conor McGregor is a Game of Thrones fan, or at the very least he couldn't pass up the opportunity to add "giant killer" to his resume.
Somewhere, Dana White is probably pulling his hair out, or at least wishing he had hair to pull out. That's the only reaction I can imagine from UFC brass to watching one of their biggest stars take on a man twice his size in a bare-knuckle sparring session in the gym. It's great publicity and it looks really cool, but it smacks of recklessness in a sport plagued by injury delays.