The idea is to be out of their field of view before they recover, not to just saunter in and strike a pose.
I think your best chance would be to not run in at all. Make other people run in until they're out of ammo, then just casually walk in.
Naked was the way to fight back in the days of the Celts. Though they might wear a torque or other mystical jewelry and talismans. So they were still clothed. Also they were clothed in faith and courage.