The breathtaking thing about baseball is how drastically the momentum can shift in a single at-bat.

So it went at the World Series in Washington Sunday, not on the field — where the Houston Astros won a 7-1 blowout — but in the stands, where the jeering crowd delivered President Donald Trump a late-innings reversal to his day.

For a president created by TV, the video bookends of the day could not have been a starker contrast. The morning began with one of the most auspicious video appearances of his presidency, as he went on camera to announce the death of Abu Bakr al-Baghdadi , the leader of the Islamic State. It ended with a Bronx cheer by the Potomac.

Mr. Trump’s announcement of the successful raid in Syria recalled President Obama’s 2011 surprise appearance to tell Americans that the Al Qaeda leader Osama Bin Laden was dead. Certainly Mr. Trump, engaged in an eternal contest with the predecessor he never ran against, seemed conscious of the parallel, calling Mr. al-Baghdadi “the biggest there is.”