In the world of baseball, mental errors can be just as costly as physical ones—and Reds catcher Tyler Stephenson learned that lesson the hard way during Thursday's matchup against the Chicago Cubs at Wrigley Field.

It all unraveled in a disastrous fourth inning for Cincinnati. With the bases loaded and the Cubs holding a 2-0 lead, Dansby Swanson grounded to third base. Reds third baseman Ke'Bryan Hayes smartly stepped on the bag for a force out, but Stephenson didn't register the play.

Instead of tagging the runner, Ian Happ, who was racing home from third, Stephenson casually stepped on home plate—completely missing the fact that the force was no longer in effect. The result? Happ scored easily, extending the Cubs' lead and turning a potential inning-ending double play into a costly mistake.

Reds.TV analyst Chris Welsh didn't hold back his frustration during the broadcast. "No! No! No! Just a middle-school mistake right here," he exclaimed. "You have to pay attention to what's going on ahead of you. Stephenson did not see the force play at third base. Once Hayes steps on the bag … you have to tag the runner. Oh my."

The play opened the floodgates for Chicago, who went on to score seven runs in the inning. Welsh later added, "Nothing is going the Reds' way right now," and during the fifth inning, he summed it up simply: "If you're gonna give one of the better offenses in baseball five outs an inning, they're gonna score runs."

For Reds fans, it's a tough reminder that even the best defensive players can have moments of lapse. And for young catchers everywhere, it's a textbook example of why staying alert on every play—no matter how routine it seems—is essential to success on the diamond.