Matty -- here's that point in the walkthrough:
Signs: Exit the room and look at the signs beside the 2 doors: the storage sign and the toilet (hygiene chamber) sign.
Use the screwdriver on both signs to get them. Put the signs back up but interchange them. The toilet sign on the left and the storage sign on the right.
Dr. Braun: Go to the reception hall and Dr. Braun.
Take a glass of wine cooler from the buffet table.
In inventory combine the wine cooler and the icky orange juice from the storage room to get spoilt wine cooler.
Use the blend of spices taken from the helicopter's spice rack on the canapés that Dr. Braun is munching on.
He starts choking. Immediately, give him the spoilt wine cooler. If too late, do the spices again.
Have you switched the signs mentioned at the beginning of the spoiler?
If you have, my only idea is that maybe you aren't giving him the drink quickly enough and you need to use the spice on the food again.
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