I clicked on the kid as soon as he kicked off from the wall, as he was already panicking while trying to hold on to the rope and it didn't give me points.
The next one in the tidal wave pool I clicked and all it did was pause the video, and when I continued the video the kid was being rescued.
There are a number of videos. Mine was a kid that fell off their float out towards the middle of the top third of the screen and panicked. Refreshing and force refreshing hasn't gotten me a new one (or I'm just getting similar ones and don't notice) but there's ~30 on youtube.
I actually spotted that kid as the first possible point of trouble... but you have to wait until the "moments later" card to see him start doing something risky, and then like you said, even when he's tangled in the rope it won't let you click him.
For that guy I waited until he started actually showing IDR signs - no lateral movement, dipping up and down. Even though he's struggling in the rope he's still managing to move around using a bad freestyle.
That thrashing around doesn't look like he's still managing. That's full on panic. As someone that has been on life guard duty, that would be enough for me to dive in and get him out.
The next one in the tidal wave pool I clicked and all it did was pause the video, and when I continued the video the kid was being rescued.
I like this though, good training, for everyone.