Just noticed the Scott AT-3's; That's a serious blast from the past. I used to ride with an AT-4 back in the '90's.
I remember that the grip area was little on the narrow side, and put you hands a lot closer together than a typical straight bar.

Couple the narrow bar with a grabby front brake and you might have experienced a high-side, where the front wheel skids under braking, then grabs traction, but if the wheels aren't straight, the rear of the bike tries to pass the front due to momentum. This happens very fast.
On a moto, the rider gets thrown over the bike and down the road, on a velo, the bike will come with you.

Your front wheel might have 'tucked under' and flicked you off.

I rode East Coast woods MTB for years, and been over the bars my share of times. Glad you weren't hurt.