I helped the neighbor lady kill some geese and chickens one time. I
grabbed the doomed bird and got it's legs and wings pinned, you can
grab both wings in one hand near their base, and the legs in the other,
doomed bird then held over bucket, nice lady then took butcher knife
and cut birds head off, lowered bird into bucket somewhat so it wasn't
spaying blood all over until spasms stopped. This method, as it was
explained to me, was used so that the bird didn't go flopping around
and bruising the meat.