This is a bar fight, so don't take it seriously. Try to show a bit of martial arts and less magic.
So..
Nathan is a 4th degree black belt, going to be 5th.
Marduk is obviously 5th.
Sairis is a 4th degree.
Chrome and Sable are 1st.

Either way martial arts is not really mandatory but it is a guarantee thing for the guild members.
EDIT: Sure, you may end it.