Here is the custom destroy script, it will unfreeze the player and get rid of the HUD if he dies while you are frozen. The PLRFREEZE command only disables player movement, so yes you can still fire a weapon. I might email Lee and ask if ALL player action can be disabled with the PLRFREEZE command, as that would be more useful, and make much more sense in a variety of situations (like this one).
Really, he is meant to be fought with a short range melee weapon with a range of 50 or so , so that you are unable to do any damage to him while you are frozen. But if you decide to fight him with a standard weapon, just use this destroy script instead. I will re-upload the character too, so future buyers will already have this script.
PS - I will send the MP17 and 18 scripts to you.
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"Your mom goes to college."