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My goose Keld is imprinted on humans, but he still takes some time to get to know strangers and feel safe around them. He likes large groups of people and will try to go to them (like if my neighbors are having a garden party), but if he gets closer, it seems like he suddenly realizes "Hey, I don't know these guys, they might be dangerous". Then the neck feathers will start shaking, and if someone makes a sudden move (like back away from the scary large bird), he'll go to level two or three.
During Christmas we went to my parent's house. My mother tried every trick in the book to get Keld to like her, but as she constantly tried to pet him or move closer to him, he actually took a dislike to her and didn't feel safe around her. My father, on the other hand, was much, much calmer. He'd sit in his chair with a crossword puzzle for hours, generally ignoring the goose. And Keld loved him; he would practically be sitting on his feet.
I've seen a similar reaction with a friend of Keld's best friend. This guy also started out ignoring Keld, just letting him gradually get closer and feel safer around him. Now, when Keld sees him, he'll run to him and let him pet him. It took about a month. And the guy never even had any treats!
In my experience, geese are the greatest cowards, constantly seeing potential threats in anything new or unusual. Keld even hissed at my parakeet when I first got it, even though it was in the cage, old and tired, and so much smaller than him. The cage is almost smaller than him, for crying out loud! For the first few days, Keld refused to go past the cage unless I lured him with a treat. But as he found out that the parakeet stayed put and didn't try to attack him, he got used to it.
If I were you, I'd spend some time just sitting down quietly near the geese. Maybe talk to them once in a while, but otherwise ignoring them. I'd bring a book so I wouldn't get bored. I think they'll start to feel safer around you, and your gander will probably begin to explore you, maybe poke at your shoes or chew your shoelaces. If you always move very slowly around them, they'll get used to you and not see you as a threat. But with a flock of geese, it requires a lot of patience and time. Good luck!