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Stunned. More so by their honesty, than anything else:

After the game, reporters crowded around the locker of Jacquian Williams, who’d forced the second fumble, hoping for an angle: Had the Giants noticed something about Kyle Williams’s technique, some weakness in the 49ers punt-return scheme? ”Nah,” Williams said. “The thing is, we knew he had four concussions, so that was our biggest thing, was to take him outta the game.” 

Devin Thomas, the reserve wide receiver who recovered both of Kyle Williams’s fumbles, was even more explicit. “He’s had a lot of concussions,” Thomas told the Star-Ledger columnist Steve Politi. “We were just like, ‘We gotta put a hit on that guy.’ … [Giants reserve safety Tyler] Sash did a great job hitting him early and he looked kind of dazed when he got up. I feel like that made a difference and he coughed it up.”