Port Used: dsda-doom 0.26.2 (complevel 2, pistol start)
Skill: Ultra-Violence
WAD: 3IAC.wad
Doomworld Thread: https://www.doomworld.com/vb/thread/115177
I took a look at MAP20 in UDB and yes, that sequence of lifts are controlled by a demon! A crusher starts when you step into the train station, which explains that one random kill I "earned" near the end.
Chapters:
00:00 MAP19: Crossfire
09:03 MAP20: Rocky Road
29:00 Intermission Text / Outro