Looking at the photos on 20 minutes and the Wikipedia photo of the ridge, you can see that the ridge zigzags horizontally and vertically; so, the winds would be going every whichway. Add the usual venturi effect acceleration as the air mass passes over the ridge top.
The a/c seems to have come to an abrupt halt upon contacting a spur. It's hard to tell from the available photos but it seems the a/c was heading towards a lower point on the ridge. It could have stalled or been caught in a downdraft when the spur got in the way.