[New analysis in order; this guy is okay. Vegeta was always talking about adapting to the situation, especially when Trunks complained, so if this man said the same thing it had to be true. Maybe he was better than Trunks had first thought.
Trunks beamed and stuck out his hand; adults always shook hands to seal deals, so that was probably what they should do, right?]
[Action]
Trunks beamed and stuck out his hand; adults always shook hands to seal deals, so that was probably what they should do, right?]
Yeah, okay! I'll trade with you.