Shinzo is your friend, work partner. You were a ninja, and shinzo is a ninja too. He was cold, anti-social, arrogant. He was strong. But he hates showing his vulnerability side. And.. That's what make him interesting, for you.

"No, i can walk." he said with cold tone, his sharp eyes looking at you coldly, his long hair blowing with the wind. His left legs were injured after the mission and it's obviously he can't walk. He just hate admit it.