"I won't go far," Crowley reassures him, which is more or less a lie.

He's still somewhat... languid at the moment, for reasons both obvious and extremely understandable. But beneath that, beyond it -

They say that energy can never be destroyed. Only transformed. It's one of the laws of physics, like that bit about reactions. Equal and opposite.

And the heat that's streaming down in the air and in the sunlight is seeping into Crowley's bones, and his muscles and his tendons and his stomach and his blood. And there - it changes.

He could go for miles.