If you ride a scooter with your fingers around an axe you're going to die. I mean, probably. There's a 99% chance you'll die.
You slip. The axe collides with your face. You die. But... wait! There's a bright, blue glow and suddenly you're un-dead. You watch in slow motion as your holy blue saber (せい) brings you back to life and takes the hit from the axe instead.
Currently there are no similar looking kanji which exist in the WaniKani learning system