I am relatively up-to-date with the manga (have read up to around chapter 40-50). I don't remember what chapter exactly, but this scene happened when Sato used a plane to bomb the building. As he confronted the S.W.A.T team, he got shot right through his head with bullets many times, after which his Ajin ability would automatically regenerate his body with the bullets still inside his head.
How could his Ajin regenerate his body while the bullets were still inside his head?