This “turn” almost does a 360. To the right side of the picture. The hill slides off to the left side more than one might think from the picture. I probably tried to make the turn too tight. The “drop”, wet pavement, and organic matter on the road did not help. I may have hit my head on the upper pavement.

Leaned over in the wet and hitting that pavement transition with rigid suspension? Yep, I can see how the tires couldn't maintain good contact.

Your mountain bike will have less traction.