Risk of injury with DD motors...

I had the awesome opportunity to experience a DD motor for the first time this week. There was one instance where the wheel spun really quickly on me, and I realized first hand the "wrist-snapping" power these motors have.

I've read people mention "wrist-snapping" or "finger-breaking" with regard to DD motors. I'm a dentist, so a wrist or finger injury for me is at a minimum financially gut-wrenching (if I had to take several weeks off work with high student loans/business loans each month) or in a worst-case scenario career ending. I had a dentist working for me who was only one year out of school who got nerve damage in his hand after a skiing accident and had to retire permanently.

Am I just being overly concerned here? Are these risks just theoretical, or are they real? Has anyone here ever been injured with their motor, or know somebody who has?
 
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