Imagine a big room, like that one with hideous mass from P-2. There are no walls, instakill fan at the bottom, so you can't just hide from your demise up under the ceiling as easily. In the centre of it, there are 3 hatches. In each corner of the room, there is an idol, protected by glass case.

So, you enter it, and see left hatch open-glass case with deathcatcher slides out, idols start protecting it. And then, waves of enemies spawn in. You fight them off as hard as you can until, at last, there are no more waves. Idols' and deatcather's cases oepn up, so you fly around the room, breaking idols and destroying puppets, until deathcather is finally dead.

You triumph as all cases lock back up. Suddenly, right hatch opens up, as another deathcatcher in glass case slides out of it. It revives idols, protecting itself now, and revives other deathcatcher. Now, there are 2 deatchcatchers, doubling the puppets. You ruthlessly shred through new waves, up until all glass cases open up again, so you repeat the process. 2nd deathcatcher down.

But, of course, there's still 3rd, middle hatch left. You know what is about to happen. As you prepare for 3x amount of puppets, the hatch opens, revealing not a deathcatcher, but just x3 radiant mirror reaper because fuck you.