After a run, once you see some big guns and most familiar faces start to disappear, you know they got out. They talk/post until they’re in it. Notice last couple of hours of trading time, they were all gone. That’s the first signal, either get out or plan long, very long because things were going to get ugly.
Don’t blame them, they know the game, they take profit (or cut loss) fast before everyone else. Smart people!