Clone Contact Test 2 Sprites, 4 clones of which bounce around the Stage. When a Clone of A hits a Clone of B, @Duezz wanted a simple way for each Clone to detect which of the other Sprite's Clones it hit. This is a really simple solution to that problem ... but it has flaws.
Remix but with a control loop, and a global collision list rather than all the broadcasts. The only time it doesn't work is when there are multiple collisions in the same frame. But this does avoid the need for the wait.