Might be normal on insane, but first time playing this far there.
Opened the door with a whole bunch of buffs ready to face Subject Z...and found him standing there as normal with a half-dead golem beside him and no yeek. I figure that he random'd into golem skills and the golem wasn't spawned with the same 'don't move until the door opens' logic. So the yeek was long dead before I arrived at the door, no scene took place at all.
Now on the right board.
[1.4.8] Subject Z spawns with Yeek Killing Golem
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[1.4.8] Subject Z spawns with Yeek Killing Golem
ToME Tips - auto-generated spoilers for ToME. - someone else made. I find super awesome, so spreading as well.