I heard a bit of a scuffle, then Claire started bawling. She can be a bit dramatic, but I figured I better check things out. Both girls were completely naked (a new favorite trick) and Claire exclaimed "sissy tried to hit me!". Audrey was holding the puzzle and calmly responded, "yeah, I bashed sissy". (Side note: where did she ever learn the word "bash"? That is definitely not a Daniel Tiger sanctioned activity!)
Needless to say, I put the puzzle away, their diapers back on, and sent them back to bed. Audrey was just singing the potty song from Daniel Tiger, and is now kicking the door so I can say with a 97% confidence interval that she is once again naked.