ok here is what he said
"I need a picture, but the tree will form meristematic tissue (cambium) around the cable. Technically the tree is being strangled, but some species are resilient. If they want to get it out, they will need bolt cutters, hammer, and chisel
The can also just cut a piece out and the links and let the tree compartmentalize the rest of the cable "
so.. it sounds like maybe just taking the bit with the rings out would be easiest? then let the tree absorb the rest.