Hivemind Challenge 3

[WtF]

Sorry, if that was a hint, i didnt get it.
I'm talking about the 3rd test quite late in the game, that starts with that star trek line "the needs of the many outweigh the life of just one".
Whether I put that block on the pressure-switch to open "Door I" and pull the lever to start the timing mechanism or not, as soon as I turn around the 3rd corner I get that star trek cutscene and have to start over...