mixed martial artist interacts with american football player .
{"Image ImageDescription": "SANTA CLARA, CA - AUGUST 20:  UFC fighter Danny Castillo (R) interacts with San Francisco 49ers offensive tackles Joe Staley at the SAP Performance Facility at Levi's Stadium on August 20, 2014 in Santa Clara, California. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)", "Image Copyright": "2014 Jeff Bottari/Zuffa LLC"}