The castle should've been on high alert and launched a point defense system. Anything or anyone that are not friendly should be taken down without any prejudice
Do these royal chefs even communicate when making food? Gordon Ramsay would've slice the head chef in half if he talks like that. Seems like chefs in the royal kitchen do have communication.
@FgoSegul I'm not gonna confirm nor deny it but eh. No witnesses, maybe? He doesn't trust the people inside that castle anyway. The old man underestimated him and tries to exploit him to do their bidding. Not gonna happen for the MC.
@FgoSegul are you forgetting that he was summoned there unknowingly and without his consent? Correct me if I'm wrong but he is justified to kill those who are not willing to return him back to his world.