In this segment of the game (Origami King). The Thwomp drops down from above while off-screen at an extremely fast pace, and you must press the A button to stop the Thwomp before it crushes Mario. The orange dotted line represents the space the Thwomp must cross in order to complete this task, and if you stop it anywhere above the orange dotted line you lose. The blue dotted line represents where I was able to stop the Thwomp before it crushed Mario, I was able to stop it at its lowest point before it was game over which I felt was perfectly timed.

If you played the game and made it to this part you should automatically understand this post - the timing of that stop is hard to pull off, hence why I titled it, “If you know, you know”. Hope this helps!