Hello, you can't break it, you have to destroy all of his core shard, there seem to be a blue area the computer still has on the mini map, there should be a core shard there if I remember right, you just have to destroy it, it's the same as the first level of the undergame
If you did destroy it and are still stuck, it's probably a bug and might need you to restart that level, good luck and happy new year=)