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Half-Life Hints
The fire shield doors are closing!
1 of 3: If for some reason the fire doors begin closing and you need to get through, duck under.
2 of 3: You can also wait for it to close fully and then hit the button that is nearby. The doors will open once more.
3 of 3: If you are the wrong side of the door when it closes and there are no buttons to open it back up, don't worry. You really do not have to go back right now. The level kind of loops around itself, so if you left something in the other area, you will be able to get back to it later.