rocket landing off of Hawaii

[TomK]

From the video I watched, it looked like it was supposed to do a very trickey controlled 180 before stage seperation. That's a monumental feat, which I think they will get right, eventually. Traditional rockets just drop the stages behind them as they go.

However, in this case, it didn't stop at 180, it just kept going, started cartwheeling, and essentially flew apart.

It was going to do a maneuver but not when the main-stage rockets were still firing and certainly not a 180-degree maneuver at that point - it would mean firing the second stage back where it came from and all that would do is drop it in the ocean very quickly.