that seems very much like the normal technique which eagles use for cutting and eating their prey with harder skin and bones than fish have.
i hope that the eagle wasn't actually eating any of that thing though... anyway, if the eagle ate anything it would be rejected and thrown out in a pellet.
i suppose that Urmas and Triin and/or other people from Kotkaklubi are watching the camera at time to time and reading the forum. i think they are aware of what is going on with the "Thing" and will take some action if it's necessary.
Finnish eagle men tried to set up a camera at a WTE nest a few years ago, but that attempt failed because some animal (a pine marten if i remember right) chewed and cut their cables. the cover of the cable or the insulation material was so tasty for the animal.
at Durbe wasps built their nest in the camouflage net around the cable connector box which is in the nest tree under the nest. so the camera system should be not only eagle-proof but also resistant against any kinds of animals, big and small.