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 …
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