# Create a new skirmish game, with only one alien to avoid combat. Equip your squad with weapons able to break glass (=windows). Select the laboratory map.
# Start the game.
# Rush to the building the the laboratory (= some sort of hangar)
# Once you are in, go upstairs.
# Try to go downstairs. It should be impossible (see screenshots "Laboratory map - Cannot go downstairs" (taken during a campaign) & "Laboratory map - Cannot go downstairs (skirmish game)")
# Go in the corridor and shot some windows.
# Set soldiers on the truck or on the container. It should be impossible to move back in the corridor, or to go down in the courtyard. (see screenshots : "Laboratory map - Trapped on the container" & "Laboratory map - Trapped on the truck")

Test was done with 20/01/2017 release.