How's he doing this morning? I would guess shock, based on the minor appearance of his injuries. Makes it sound like maybe he took a nose-dive into something. Maybe something startled him and he flapped/ran right into something, hard enough to scratch and tear his beak/bill a bit??? If he's in shock, just keeping him contained and settled, and babying him a bit should help. Offer some type of special treats to get him eating (not sure what treats are for a goose...chickens love scrambled egg). Hopefully there is no internal damage, and he will be back to normal within a few days. Oh...you can also put electrolites in his water for an extra pick-me-up...