HL2 FFCM help/question

[RedSkull]

hey im playing hl2 for the first time through using the CM and am kind of stuck at what im afraid is a gltich
i think im near the end of the anticitizen one level on a rooftop with a drop bridge that spins wildy only stopping if i happen to be on it or one of the npcs....
never drops in the right orientation, or if it does, im kind of frozen on it and when i jump to move it spins to a new direction
ive tried getting one of the npcs to get near it to stop it spinning but theyre retarded and mess it up every time. no object i can find will stop it either the bridge just bashes it out of the way
is this a normal part of the game and im missing some clue as to how to stop it or is it some sort of glitch and if so how could i fix it?
heres pics of where i mean


http://www.departuremusic.net/uploads/hl2%202007-12-09%2010-54-16-25.JPG
http://www.departuremusic.net/uploads/hl2%202007-12-09%2010-54-17-82.JPG
http://www.departuremusic.net/uploads/hl2%202007-12-09%2010-54-18-37.JPG

[TommyHolly]

Hmmm I remember that part. You walk out to the edge, kill some bad guys on the other roof, and hit that pulley thing to trigger the drawbridge to come down so you can walk across.

[RedSkull]

no but that drawbridge it spinning like mad, notice its changed in each position?
is that normal?
im thinking its not because on the rare occasion i get it to stop by jumping near it and pull the lever it spins right though the walls of the building while extended