... This is driving me a little crazy, I swear that I saw this one translated here on Danbooru, but the history denies it.

The effective translations, as I recall them... Duck's speech bubble says "... you saw?" The speech bubble from offscreen says "I didn't see." The note with an arrow pointing to that speech bubble says "He saw!"

Again, this is my fuzzy memory of the gist of the translation, and I have no knowledge myself of moonrunes, so I don't think it would be good for me to put up the translation myself.