The Chiefs (2-0), who began their bid to become the first three-time Super Bowl champions, have certainly been living on the edge of late. Ten days after nearly blowing a 10-point fourth-quarter lead — and being lucky to have Isaiah Likely’s potential game-tying touchdown overturned on instant replay as time expired in the fourth quarter because his right big toe wound up on the chalk line — they were pushed to the limit by a rival trying to bounce back from an embarrassing Week 1 loss.

The lead changed five times in the second half on Sunday. Before Butker’s clutch kick and Anthony’s penalty, the “one play” might have been the 38-yard scoop-and-score fumble recovery return by Charmarri Conner that allowed KC to regain the lead. Or maybe it was Conner’s 9-yard sack of Burrow on a final blitz later in the quarter that forced a point. On the other hand, Bengals kicker Evan McPherson, who made a 53-yard field goal, missed a PAT in the third quarter. And so on. One play here, one play there.

Andy Reid’s team is still undefeated, in part because their opponents haven’t rammed through the door that was left ajar. In the first two weeks of the season, the Chiefs have shown that the gap between the champions and other contenders is still quite wide. Even Reid wouldn’t deny that there’s still plenty of room for improvement—and new challenges, too, given that running back Isiah Pacheco suffered an ankle injury and left the stadium on crutches wearing a running shoe.