Stiles is reminded of that fact when he hears the laugh, the hair on the back of his neck prickling. He's never been one to back down just because of a potential threat, even if he probably should.

"I'm sorry, were you expecting something handwritten with gilding on it?"

He gave Isaac a purposefully cavalier look before he picked up his clothes and left the kitchen, heading upstairs for the shower. Isaac was welcome to do whatever he wanted, but they both knew a challenge of sorts had been put down.