This fight's insanely drawn out, jesus. It's like the author forgot this is supposed to be a battle manga and thought to cram all the missing action here, except there's not really any action to speak of.
@Ringz Maybe it's like his level is ??? to them, so they don't even pick up on his power. People like Orochi, Boros, and Asura Rhino, could feel his power because they were just close enough.
God the art varies from decent to shit. And the fight feels kinda meh, considering that none of the abilities used have any actual meaning or frame of reference.
Make Stuff Up for why the MC doesn't do certain things, lads. I'ma boil it down to him not thinking it a problem, based on how the author presented him at the start, killing assassins without caring about getting information.