Aranfan
Team Plasma Grunt
I see a lot of people assuming that because someone says "Oathbreaker" that that term instantly becomes true. Can't you imagine a situation where overzealous enforcement of a contract leads to both sides believing that they're in the right? Oh wait, that happens all the time. In fact one of the main tropes of spirit stories is how they hold the letter of contract to absurd standards.
I mean, I'm personally more convinced by the "mad beast" being perfectly reasonable. After that, the oathbreaker part becomes an add, rather than the decisive bit.