He may have meant it raised a question for him and no one else. This isn't the logical jump an average person makes after touching a scorpion. How much would it hurt to be stung by the next two most painful scorpions?
So, yeah. He intentionally gets stung by two scorpions on the same night.
"The reason that I'm being stung," Peterson says, "is to prove that it's not all about size. Size doesn't necessarily matter when it comes to the pain and potency of a sting." Would anyone have doubted him? No?
The stripe-tailed scorpion is smaller than the giant desert hairy, and it proves to have the most pain packed in its bulb. Peterson notes a rule of thumb is the smaller the scorpion's pedipalps (pincers) the more potent the sting.
As always, Peterson talks about the precautions and says to never do this on your own. So, heed that warning even though there are no reported cases of either scorpion causing a human death.