Was he his former vice-captain's son?
"This relationship isn't even that close. Why didn't his father come teach him himself?"
Watching Ichigo Kurosaki, covered in blood and collapsed in the street, Yinsen waited until Renji Abarai and Byakuya Kuchiki had left with Rukia before stepping out from the shadows.
By then, Ichigo Kurosaki was barely conscious and had no idea Yinsen was approaching. Seeing that he was in poor condition, Yinsen used Kaido to give him some simple treatment, making sure he wouldn't die on the way back. Only then did he pick the brat up like a piece of luggage and head back.
As for the equally injured Uryu Ishida? Yinsen couldn't be bothered with him. His injuries weren't serious anyway, and his father was looking after him—Ryuken Ishida, being a surgeon, was better at treating human injuries.
"Who are you?"
Uryu Ishida rose while clutching his wound. It seemed his injuries truly weren't worth worrying about if he still had the strength to ask Yinsen's identity.
"Rather than that, you should worry about yourself!"
Yinsen glanced at Uryu Ishida, then carried Ichigo Kurosaki away with Shunpo.
Even if Uryu Ishida was worried, he couldn't catch up with Yinsen. Besides, Yinsen had treated Ichigo Kurosaki earlier. He felt... this person probably wouldn't harm Ichigo Kurosaki, right?
Of course Yinsen wouldn't harm Ichigo Kurosaki. After all, he was his beloved vice-captain's son!
After bringing him back to Urahara Shop, Yinsen treated Ichigo Kurosaki's badly damaged Spirit Body. If Yinsen hadn't held back, he could have healed Ichigo Kurosaki completely, but that would have defeated the purpose of tempering him. He stopped at the appropriate point.
"My, my. As expected of someone from the Fourth Division. That Kaido of yours is truly astonishing."
Kisuke Urahara felt that even Retsu Unohana, captain