Getting Dad his <12.99
If it broke in first and the engine revved, take the trans out and inspect it.
What about if the engine did not rev, would there be any reason to suspect an issue?
The engine did not freely rev when it happened, I heard/felt crunchiness and immediately lifted off the throttle and got in the brakes (still had my left foot hovering over the brake pedal.) I quickly brought it to a complete stop and gave a brief damage assessment (engine idling, no trail of parts/oil, driveshaft not hanging down, car shifted to drive and reverse, etc.) Even with that much damage to the gears, the car was still able to drive to get me to the side of the road (where I then got more clunking and popping), and back into the garage (with some more clunking and popping) after the tow truck set it down in my driveway, so all of that carnage wasn't from one "kaboom" moment. Total distance traveled was less than 100' after breakage and I'd wager that the majority of the broken teeth happened just from circulating whatever broke initially, while on the brakes and/or during the 2 short distances that I moved it under (minimal) power.
From what I'm reading, the risk of sprag damage is mostly due to high revving in gear with no load (from a broken driveshaft, axleshafts, completely stripped gears, etc.) and may not apply to this specific scenario?