I've seen a lot of roller clutches fail at the hit footbraking, even for me once. Usually, the guy gets his foot out of it before anything bad happens, or like me, they are using a 904.

If it's not your lucky day, you have a problem. Floor, dash, windshield, roof, feet, legs, etc....

Roller clutches can and will fail. Regardless the good parts used. The bad stuff happens in a 727 with a stock cast drum and the engine spun over 5K if you don't get your foot out of it.