Wrote Himself Into A Corner, So He Boldly Wrote Himself Out Of It.

It's the Day's Day of Days! Because The Goddess.

There's a part of me that suspects that Muir started to realize on some level that he was revealing how little he actually knew about the Founding Fathers and the Revolutionary War, on top of which he had no way to wrap the storyline up, so... 

The escape hatch.