SOS major agrippa issue

[IceLemon]

this is my fourth playthrough.

i left agrippa aside after i entered the nave, didnt pull the switch for him either. i was thinking of getting the potion ready then get back to him and do everything at once.

BUT !!!!!
after i escaped the cell which the brute threw me in and entered the nave, the red slime was everywhere. when i finished making the potion and got back to where he was, HIS HEAD WAS ALREADY GONE !!!! WTH!?
my jaw almost dropped as i held the potion and stared at his headless body like a moron.
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what's the reason? is it because of the switch?
what does the switch do anyways? Agrippa seems tortured by something before we pull the switch for him. what was he bothered by?