He caws a very giggly kind of caw and starts scratching at the dirt next to her message.

After a minute or so of trying and failing to replicate her readable letters, he hops onto SUICIDE, scratches it out with a sweep of his talon, steps neatly to the end of the word, and draws a crude pictogram of a shield. Then he points his beak at the revised message, points his beak at her, and stands next to it, preening.