Ok i was arguing god existing or not with a guy. Not my goal here lol

I told him about sonething that happen to me when i was 19
My dad and i was at a range. My ruger p89dc jammed bad. The slide was part back with a spent round stuck. I pulled pushed banged it for five minutes and while not paying attention i made what to the day was the biggest mistake with a firearm of my life. I had put the grip on the bench to gain leverage while pushing the slide back. The mistake was the barrel was pointed right at my face. I know dumb deadly and i was young dumb and been around firearms for not a year.
In the split second that i broke the slide free it ejected the spent jack the slide slipped my hand went forward racking the following round and my finger slipped pressing the trigger and click. Realizing what just happen i sat the gun down when i quit shaking i removed the mag figuring the chamber was empty i racked the slide and out pops a full metal jacketed unfired round. I started shaking again lol. When i picked up the round the primer was indented as it should but it did not go off

I told my dad who was in the booth next to me and the shop owner. Both agreed i was the luckest man alive in that moment

Well the guy i told this to swear primers fail all the time and fail to fire a round. Iv fired prob 25000-30000 rounds in my life this is the only time iv had it happen to me. I chuck it up to god really likes me.

So what are the odds of a primer being indented but not firing the round. Givin good quality ammo