A 65-yard interception return by Justin Simmons of Dolphins' quarterback Jay Cutler was the Broncos' only touchdown of the game, as the offense only managed one other scoring play &#8212; a 31-yard field goal by placekicker Brandon McManus. The Broncos surrendered two safeties &#8212; one off a fumbled snap and the other when Isaiah McKenzie muffed a punt in the end zone, and also had a punt blocked. Quarterback Trevor Siemian threw three interceptions &#8212; one of which was returned for a touchdown, the offense went 1-for-13 on third down and gained 270 net yards, their lowest output of the season.. How many thrid downs did the Broncos convert?