I agree with you.
But. He was not hiding, caving after the murders. Rather opposite, he was out working, in the uni. Not a single soul, so far (emphasising on so far), reported any visible injuries, scratches, bruises on his face and arms. When I was about to teach my students, I had to dress and groom impeccably, as students notice every single distortion or imperfection on tutors. I wished some of them to be equally focused on perfecting their studies, but that is a different story.
There is only one thing in relation to BK case: it is not clear where he was from 14th of November to 27th of Nov, as there might be no classes at the uni. This has to be confirmed, somehow.
If he was staying at his apartment, then his injuries may have healed during that period. But if he was going to his office at the uni, then there would be some witnesses to share their observations of him, for sure.
Puzzling.