So I was replaying Night of the Comet the other day, and some sort of glitch happened during the bar fight scene. I wasn't able to inflict any damage on any Starfleet or Klingon officers in the room - firing on them, burning them in flames, using Hyperonic Radiation... nothing worked... as if they were all immune to damage. Yet I was still able to kill the Devidians and continue on with the mission objectives.
After the Devidian Phantasm boss was defeated, it was pretty funny walking with Scotty, only to still find the Fed and KDF officers in the bar room shooting at each other...and me...
And they continued shooting at each other even while I was asking the bartender to make me a drink for Cassidy. Can you imagine the nerve?
I got about two dozen critical injuries from that mission, but they healed automatically when it was over.