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Glitches (hard)

Requires knowledge of source engine physics and glitches.
Yes, it's actually completable without cheating, it can get pretty hard though so you might want to quicksave.

Tips:
1. The orange tractor beam meaningless, it's just a distraction from the real solution.
2. Props gain velocity when they get stuck.
3. You run slightly faster by strafing against a wall while holding forward.
4. Window frames can be walked on.
5. If you hold a prop through a portal when it breaks, the prop drops on the other side.