If you are a good race enchanter, watch out. This guy will see through your illusion and kill you.
It may or may not have something to do with religion- my Tunarian chanty got killed by him, even though all the other guards liked me ok (dubious). Other chanters I've talked to, whose religions I do not know, have also been spotted and killed by this guy.
Whatever your religion or history of killing, I would be on the safe side and invis, invis, invis- at least until you are past this guy.