I have a question.

I've looked at various different images processed from this image data, all a little different.

What I've yet to see from the bright streak (smoker plume) is a shadow.

The image posted on Felix's site is just bad enough to convey the impression that yes, it's a curly little plume drifting over the adjacent ridge. But IMNSHO, it is a little ridge running up the saddle- slope and connected to a bright spot on the the near side and a ridge on the far side of the spine.

Indeed, if you look at a non JPEG image at a scale where the structure suggested by the image is more reliable.....It's not so impressive.

Just take this image into paint and zoom in just once to convince yourself. The plume is bunk, sorry folks. It was a nice thought and in a plausable location but the image you're using isn't even the best available from that MOC pass.