There are no health meters in Sky Noon; instead, to eliminate enemies, players use various super-power
compressed air weapons to send them flying out of their boot spurs!
I explained they were harmless, and essentially highly
compressed air slipping over a structure moving at greater than the speed of sound... or an explosive wave expansion that moves out and then rebounds in... and so, the
compressed waves move into our area from the
weapons test area, and shake the glass windows, and we hear the sonic «sound» (or the wave's double sound) and the vibrational aspect of the glass within the window.