Doc keeps his distance from the stall, watching the two of them together, arms crossed lightly over his chest and leaning against a wall. He doesn't move - Corella knows he's there, alright - but he's not about to do anything that might spook her when Katherine is in the stall with her.

It's something that makes him smile, thoughtfully.

She's got a hell of a way with horses.

He'll wait until she exits the stall, however, to speak.