SANTA CLARA, Calif. — In the span of a few seconds, Brock Purdy stepped into the same world of hurt that Bo Nix has called home all offseason.

A handful of 11-on-11 reps into Thursday’s joint practice with the Broncos, San Francisco head coach Kyle Shanahan’s freewheeling offense started spinning its wheels in the trenches. John Franklin-Myers and D.J. Jones gobbled up a handoff to 49ers stud Christian McCaffrey. Zach Allen and Levelle Bailey sniffed out another toss. Dondrea Tillman chased Purdy around on a rollout. Bodies shuffled off the turf, and it seemed for a moment that Shanahan’s attack would draw a reprieve, Purdy with a chance to attack third-stringers.

Didn’t help.

Immediately, Eyioma Uwazurike and rookie Sai’vion Jones deflated the pocket in on Purdy for a would-be sack. Im

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