Once the towel is fetched, it is Doc's cue to pull the plug and remove himself from the tub of soapy water. The moment for self-consciousness has already come and long gone - Malcolm knows where the door is if he's mortified, offended, or some combination of both by such a boorish display of bare cowboy butt - so he rinses himself off without fanfare under the shower for half a minute before taking the towel.

"You're not goin' out there, are you?" Short of simply losing consciousness from sheer exhaustion, there's no way Doc would find any rest if he's alone in a bed where the house is missing some folks.