https://milde.no/public/sm/deathspot.png

This is Ridley's exact "death spot". Once he grabs you after 0 HP, he'll try to accelerate towards that spot. And once there (he needs to collide with a specific pixel, with a margin of 4 pixels), he'll start exploding and all of that (though it always takes 32 frames after he collides with the spot until he actually stops).

Since he'll grab you from different positions, while having different types of speeds and such, this might happen fast or not. What you want to do, is to kinda calculate his trajectory such that after you're grabbed, he'll go straight through the death spot.

Fast: https://milde.no/public/sm/fast.mp4
Slow: https://milde.no/public/sm/slow.mp4