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Half-Life: Opposing Force Hints
How do I get into the observation deck with the scientist and security guard?
1 of 6: The door will not open from this side; it is locked.
2 of 6: Unfortunately, the scientist and the security guard seem to be preoccupied.
3 of 6: Something has teleported in. Some form of alien that has never been seen before. The alien is known as a shocktrooper.
4 of 6: There is nothing you can do. The alien transports in, kills the guard, and then transports out dragging the scientist with him.
5 of 6: The concussion left by the teleporting alien breaks the nearby window. You can now jump through and into the observation deck.
6 of 6: And you can open the door from the other side to let your fatguard friend in if you still have him.