We used to have some geese on the ranch I grew up on, and I use to like to get down at their level, sitting on my haunches, and use my arm as a faux goose head and neck. Snaking it up and down, back and forth. Drove the gander into fits. He'd charge, and I'd stand up and throw my arms out wide. Face to face with a taller creature, geese will back down, but don't turn your back on 'em for a moment.