So is the stalled vessel above the lower vessel doing the U-Turn? If you say the lower U-Turn vessel is connected to the center point, then I would have to respectfully disagree, since it looks like two separate vessel's. It may also be an issue on my end, with not being able to see more of the movie to make a good judgment.
The point at the center could also be the occasional "fragment" seen in movies, that doesn't connect back to any specific vessel.
The next time a movie is added to the Challenging Vessel's section, the mouse pointer should be captured as well, so that it's easier to point out and hover over the target vessel, while also pointing out the stalled area's.