Jen Johnson’s Santa Claus wears gold and doesn’t need reindeer to fly. Gabe Landeskog wiped his nose. Cale Makar shook his hand. But no athlete danced — like, seriously danced — with Jen’s son Porter until Travis Hunter walked into their life. “You know how to do The Griddy?” Porter asked the CU Buffs’ two-way football star. “Show me,” Hunter said. Which is the short version of how a 9-year-old cancer survivor made a Heisman Trophy winner break down laughing. While Hunter watched, young Porter launched into Minnesota Vikings wideout Justin Jefferson’s trademark touchdown celebration dance, The Griddy.