Cal did many things poorly. They threw the ball away for no particular reason. They forced shots and passed up better looks. They let the Buffs do what they wanted on offense.
Add it up and it's an incredibly disappointing 13 point loss. Cal's only offense came via the 3 pointer, and as soon as those shots stopped falling the Bears were doomed.
Cal no longer controls their own destiny for the Pac-12 title. Discuss, commiserate, vent in a respectable fashion. This one hurts.