Charles Ellicott Commentary Isaiah 46:2

"They stoop, they bow down together; they could not deliver the burden, but themselves are gone into captivity." — Isaiah 46:2 (ASV)

They could not deliver the burden. —The deities are, for the moment, distinguished from their images. They are powerless to rescue them. So far as they have a soul or being at all, that very being is carried away captive.