While he'd never seen anything other than another human pull off the look, Kade knows what longing looks like. He knows the look, remembers his family giving it as they yearned to be doing their jobs that the Morebots usurped with their more efficient and dangerous style that Morocco somehow touted as safer.

In a happier time, when he was a fireman, he remembers giving Hayley that very look many times before they actually hooked up.

Without a doubt, Kade knows longing, certainly well enough that he's caught way off guard when he catches a robot with the expression. A robot pulling off expression was weird enough, but the surly leader of the so called “Rescue Bots” wanting anyone was something he just didn't expect to witness, even with the crazy story of the bot being his partner that Cody had told him. But, he'd caught Heatwave throughout the day, out of the corner of his eye, watching him with so much...want. With a sadness in his optics that Kade is sure means he had something going on in that other timeline.