Grab a linoleum cutter (scalpel like instrument) from the art room. Get in a tactical position where I can't be easily detected. Wait for one of the assailants to get isolated from the group. Quickly take him out, procuring his weapon (and possibly uniform in the process). (If uniform was taken) wait for the other assailants to regroup before opening fire on them in a sneak attack. Win. (If uniform was unrecoverable) repeat the plan until I have a second weapon to arm one of my peers. Eliminate the intruders. Win or die trying...