Yedi masters, eh?
The arena offers no protection, and if we assume the weapons being used are conventional firearms and not SW blaster pistols, etc., it could be pretty difficult. IIRC, slug firearms used in Shatterpoint gave Mace trouble. About four or five jedi masters did die on Geonosis, so it's not like any random Jedi Master is going to be comparable to Mace himself. And while it's not like he's going to go down in milliseconds, the idea of ten Jedi Masters plus Samuel L Jackson killing that many firing agents seems difficult to believe.