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Two thoughts I had- MANGA SPOILER WARNING!
After cleaning himself up, Hizashi goes to the hospital with Toshinori. After making the medical decisions on behalf of Aizawa and checking on him- he left after hours. He left to go to Nemuris apartment. To pick up Sushi.
He brings Sushi to UA, tries explaining the situation to Eri as best he can.
"Hey, there, anklebiter... Remember Ms Midnight...? She- she wants your help! Think you're up to it, kid?"
"This is Sushi. He's- He's Ms Midnight's cat- Yeah! Like the cats on the clothes Mr Aizawa got for you! We have to take care of him for a while, right, Eri? I'm going to have to be away for a while too but the other teachers will stay right here to help."
He has enough energy to pretend to be Sushi- he has to. For Eri. Hizashi puts on a goofy voice and makes Sushi wave a paw "Hi there Eri! I can't wait to become your new friend!"
Hizashi starts looking at Aizawa weirdly. Giving him side glances. Avoiding eyecontact. Eyes fast. Aizawa thinks its because he lost an eye and a leg and doesn't pay any mind to it. Hizashi does it because he's thinking of the fact that Aizawa's supposed to be dead. It was for Shota. Not Oboro.