I taught her to shoot the Glock safely, with no "Glock thumb". Not the other way around. The bandaged arm in the picture was mine. Dix has fired the weapon many times and has just taken delivery of one of his own. He forgot and paid the price.
I neglected to inform COB1 about "Glock thumb". I forgot and COB1 paid the price. We are not into pain or tragedy. We are into a fun, productive and safe time at the range.
Stay safe; stay armed.