Sorry for BUMP, but i think i know how the bug works. If you respawn right at beggining before there are 5 secs left till beggining of game you" ll have a clone, andt he only way to kill it is to shoot it till it gets in no area.
this is true. However, only some people can do it for some reason, I haven't quite placed it... I think you may have to be the oldest person in the party (ie, have been in the party the longest out of all players).
You can host your own party and do this all the time... just respawn during the last 5 seconds of warmup. Infact, I've made up to, 5 clones, i think.... 4 or 5... cant remember.... just rapid respawn.