Stuck rope = hunker down, but STAY TIED IN!!!
And fuck the whistle. Someone already went for help, your whistle is just making a scene.
There is inherent risk in climbing. One risk is that your rope may get stuck and you may spend a few hours on a ledge TIED IN to the stuck rope, waiting for help.
The moral of the story is, at a minimum, all newbies should know that they stay TIED IN until directly told to untie by someone who knows what they are doing.
It wasn't mentioned, but the belayer should probably know how to escape the belay so they can go for help if needed.
More anchors would have made this a little easier, but not any safer.