Toward the top of the Geronimo trail at South Mountain. String of crashes, including tagging a saguaro, culminating in a crash resulting from tearing a tubeless tire off the rim.
This was the first time on this trail and was riding a decidedly XC bike, certainly not something in the AM, FR or DH realm.
New to descending, made some mental and technique adjustments after these crashes and did much better. The rest of the ride and the second run were far less eventful.