Adam Clarke on Ezekiel 10:8

The form of a man's hand under their wings - I am still of opinion that the hands and wings were not distinct. The arms were feathered like wings, and the hand terminated the arm; but as the long front feathers of the wings would extend much beyond the fingers, hence the hands would appear to be under the wings. See on Eze 1:8 (note). The human hand might be intended to show that God helps and punishes man by man; and that, in the general operations of his providence, he makes use of human agency.