The solution was, at least as of now, too obtuse to find. I think it's because I'm unsure of my goal once the "twist" occurs.
Viewing post in EnantiO jam comments
Yes, this part of the game is the only real interactive moment of EnantiO.
When you can't do anything, it's the moment you can really act ^_^
In EnantiO, it is not only the game that goes out of its frame, it is also the player who leaves his role of passive player.
I'll give the solution in the game description when it will be allowed to rate the game for the GameJam , in aim to help everyone to finish this short game (that can be very long and frustrating, if the player doesn't find the solution ^^).
And obvisouly : THANKS for playing EnantiO ! ^_^