I think your solution was excellent, but I inferred the following text meant they never got to the exit so no need to block it
"When the PCs think they are reaching the room that leads to the exit, they end up facing a corridor going left and right! The exit seems no longer to exist... The Leader can then insist on the psychological effects by describing the feeling of panic starting to take hold on the PCs as they compulsively check the exactness of their map. Being confronted with this distortion between their map and the refinery induces a Complicated (14) Mental Resistance roll for each PC."
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RE: Refunding health, etc.
I thought refunding them at Act 1 makes them think Act 2 might be real, of course they would get refunded again at the end of Act 2 ... I wish this aspect of the scenario was clearer.
Could someone clarify the authors intent? Thanks!