It didn’t matter what the Denver Broncos were doing on defense — they struggled facing the Indianapolis Colts in every phase. They lacked discipline, both in the form of performance and penalties. In the run game, players were losing lane discipline and opening holes for the Colts ball carriers to run through.
When defending the pass, the rushers didn’t stay in their lane, allowing openings for Andrew Luck to escape through. If that wasn’t the case, then the secondary lost discipline and allowed their assignments to break free. Some instances, both happened.