Exactly my thoughts and experience: I was carefully spying the two dudes to see who had the mask and then BOOM they started running!
After that I just kept killing everyone to be sure :)
Great mysterious vibes, nice noses on them masks
For me also the music stopped at somepoint, I don't know if you have some looping in place Nemo? I do my music looping as such:
in an Autoloaded scene, I create a AudioStreamPlayer node and when it signals _finished, I just type: AudioStreamPlayer.play() and then its always on loop, always playing all the time hehe