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The Orange Box: Portal Hints
What do I do if I'm still on the stairs when they descend?
1 of 4: Use portals to get yourself out of there.
2 of 4: Fire a blue portal at the ceiling past the stairs.
3 of 4: Then fire an orange portal at the floor near you.
4 of 4: Drop through the orange portal to end up on the floor past the stairs.
