Caleb is not in the right head space, depression is not to be messed with. Luckily, Asa is seemingly good at standing his ground. He's got a lead on Caleb and is walking him in circles, not allowing him to buck or run. Just what Caleb needs.
Not only that, but Asa's ability to see what doctors can't is another need Caleb had...because poisoned... nice twist.
Wait… I swear I read that Asa thought Caleb smelled like Dr. Pepper poured over ice with coconut creamer and a splash of lime…
Hmm. You must have deleted that suggestion. Shame.