After Affects of Primer Detonation

I didn't capture the detonation on video, but recorded this right after it happened to show the damage (or lack there of) caused.
- Press: Lee Load Master
- Primers: CCI small pistol primers
- Case: Guilio-Fiocchi-Lecco (GFL) picked up off the range floor
- Damage: 5-10 seconds of my ears ringing and 9 primers wasted. Otherwise, not much, praise the Lord! The explosion was about the size of a basketball, maybe a little bigger, right under the dies on (the top of) my press.
Nothing obvious seemed wrong with the case, primer, press, or anything else. It was just weird that it detonated. In the past, I have accidentally loaded primers sideways, upside down, one on top of another, etc. I've never had a detonation prior to this one.
If you see anything I may have done wrong, please let me know so I can avoid it in the future.

[@matthewcornelison4786]

Very fortunate brother

[@jeremyhood]

Indeed! Praise the Lord!