They can hit pretty hard with their beaks. Just remember to maintain eye contact (like mentioned above). That is probably the most important rule when facing down a goose (or any number of them, they like to fight in packs.) Also another important strategy is to spread your lats out, this will intimidate them. If the challenge is accepted the goose will spread its wings out as a sign to commence battle. The best way to start off the fight is to run straight at it and flap your arms while still spreading your lats (hard to do, but easily accomplished with a few weeks training.) The goose will either be scared off at this point, or ready to take you on. If the latter is true, prepare for a long fight because once a goose decided to attack, he's in it to win it.