The “mirror” of ice in the center of the room divides the two sides. On the far side (from the entrance) 4 of the token mobs spawn as well as some endermen. On the near side, a bunch of enderman spawn. You can swap between the sides by running to the mirror(though I think you have to start at the back wall, then run to it). When you switch sides, new mobs spawn.
You don’t actually need to kill all the mobs before switching sides either. So at the far end, kill what you want, run to the end and then to the mirror, swap sodes. On the near end, kill what ever mobs (none contribute) then run to the end and then to the mirror- new mobs should spawn
Also, I felt like this video( https://m.youtube.com/watch?v=qCwm3n0vO1c&ra=m) helped me understand the dungeon a bit yeaterday after failing the parkour for an hour lol). Hope this helps and good luck!!
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