Geese are mean and scary, but that doesn't make them deadly. Unless they get a super lucky shot on a major artery they can't kill you. You might end up with some deep scratches but I don't think a goose could even break anything more than your hand. If it's a fight to the death at the end of the day you can just run at the goose and tackle it, sacrificing your face and legs and arms to some really bad scratches.