I looked at it, it was a mod submitted by Omega. You start off on a small platform with a long spear that has a blade at the end of it. You're thrust forwards after that towards a larger platform where you meet your opponent.

Might be a bad mod for you though, you weren't really that good with weapons when you participated in that Gladiator event a while back, though you have my best wishes with you for a good match. Good luck Nerboob. <3