View Photo Gallery: Demaryius Thomas knows now that the game was over when he scored. (Doug Pensinger | Getty Images)

The NFL playoff game between the Denver Broncos and Pittsburgh Steelers ended so suddenly that fans scarcely had time to get confused over the new overtime system. The same was true for at least one of the key players Sunday.

Although the system, which applies only to the playoffs, was applicable to postseason 2011, it never was used because not a single game went into overtime.

Coach John Fox had briefed his team last week about the rules, but one guy, the guy who scored the game-winning touchdown on an 80-yard reception from Tim Tebow on the first play of OT, wasn’t sure it was over.

“I saw [cornerback] Champ [Bailey] run up to me in the tunnel [where his momentum had carried him], and I was like, ‘What’s going on?’ ” Demaryius Thomas, wearing a “Dominate Another Day” T-shirt, said Monday (via the Denver Post’s Lindsay Jones).

He’s got another week to study them.

Early Lead: OT explained

H/T Pro Football Talk’s Gregg Rosenthal