From TEAMUSA.org, By Maura Gladys: Ervin at the 2012 Austin Grand Prix Anthony Ervin squirms at the word “comeback.”“It’s not a comeback,” he says. “I’m just swimming again. I’m just enjoying what I’m doing and the environment that I’m in.” But when Anthony Ervin’s hand touched the wall at the end of the men’s 50-meter freestyle at this weekend’s USA Swimming Grand Prix in Austin, Texas, th…