With his back turned, he had missed that resulting smile but had he caught it, he might have been smug that he could make Arthur smile like that.

As Clarkie did with everything else (ie: a person's mannerisms, speech patterns, slang and posture), Clarkie filed that information away under the mental file dedicated solely to Arthur. Which was growing ever bigger, especially tonight.

He nodded. "That makes sense," he said after a moment of considering that. "We'll have to make sure we steal a car with tinted windows." Or hope that it's cloudy.