He is probably the most sheltered hitman ever. That he has seen bad things, had to fight to protect his home and his friends are certain but he has never other than traveling back and forth from the future he has never left Namimori.

Yamamoto listens, his chuckle and smile earnest "That's a good warning! I'm glad we met, but could you show me how?" He gestures towards the machine, he wouldn't mind trying once though he is more a sports-type it's nice to have another person to talk to. And for the young hitman who doesn't often have adult supervision except at home where his dad is the best of the best it's nice to be around one who gives advice like Pratt is doing.