"Vernon has a psychosomatic induced hamstring injury. It started after Vernon was battered by Kam Chancelor in 2012 at the Clink where Davis suffered a significant concussion. He developed an anxiety when playing in Seattle after suffering that trauma. When his team was getting rocked against the Seahawks last weekend he toughed out his anxiety and played anyways. But the physically intimidating play of Seattle's defense and finally after Richard Sherman snatched the interception over Vernon's head his anxiety and fear manifested into this imagined hamstring injury. The kid is fine and will be back again soon"
49er's Team Medical Director