Williams caught a back-shoulder fade from Kaepernick at the expense of rookie Marcus Cooper.
With the second-team offense and first-team defense competing in a move-the-ball period, Chad Halldisplayed impeccable concentration to make a juggling touchdown catch behind Pro Bowl safetyDonte Whitner.
The clutch reception would not have happened if not for another key play, a 21-yard jump ball grab from second-year wideoutA.J. Jenkins over starting cornerback Tarell Brown.
Kaepernick completed his annual deep ball to Vernon Davis on a 30-yard wheel route against rookieTravis Johnson.
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