Assuming the position/track charts I'm seeing are
accurate, it really, really, really looks like the ACX Crystal
intentionally doubled-back
twice as if it were deliberately trying to strike the Fitzgerald. Perhaps someone more knowledgeable in nautical stuff could give me a reason for these maneuvers.
I'm not saying it couldn't be some other FUBAR sequence of errors or miscommunications, because that kind of thing has certainly happened before with ships, trains, cars, and aircraft... but it looks really damn fishy.
For reference, the impact point is the near 90deg. turn in in the upper left.