Swans aren't very dangerous. The whole "a swan can break a man's arm" thing is a total myth.

>You may be left with someone bruising if you’re the target of their feathered frenzy, but since swan bones are much thinner than that of a human (and hollow) they would be hard-pressed to do any lasting damage. Some bird experts suggest that it’s more likely a swan would hurt itself if its attack was so intense.

https://metro.co.uk/2018/04/07/can-swan-break-arm-7448795/