He caught her with egg on her face! This femme fatale has been eating the eggs of the 3 other hens.
The level of information on the misbehavior of hens is sadly lacking on the Internet. Wikopedia has failed us. Is this what chicken maevens call "cannibalism"?
Look at that unrepentant face. She planning her next eggsecution. What to do? Isolation? Rehab? Debeaking?