Have you had your typically non-stinging scorpions (those that have large claws to crush prey instead) use it's stinger? My heterometrus spinifer used it's stinger once on a rogue cricket. It's not even a large prey item relative to him as he's an adult. The cricket was a really energetic one and when he caught it it struggled hard so he started stinging like a madman. Poop flew onto the wall and one leg popped off the cricket from all the grabbing. It was really impressive to watch lol.