It’s the second major injury Thurmond has had to come back from in four years. The Seattle Seahawks activated third-year cornerback Walter Thurmond from the physically unable to perform list on Wednesday. 22, and Seattle had until Monday to activate him. Thurmond was a fourth-round draft choice out of Oregon in 2010, chosen as he was coming off a serious knee injury he suffered early in his senior season. He takes the spot on the 53-man roster that opened up when the Seahawks waived Charly Martin on Tuesday. He remained on the Physically Unable to Perform list in August and through the start of the regular season, which required him to miss at least the first six games.