General Argos, using a giant AoE skill and then a halberd slam that makes a ton of rubble. In a bugfix, Seismic Slash had some association with rubble, so we can safely say this is that.
This would also seem to be Lord Elius, judging by the weapons lying on the ground, how it seems like an interrogation and the green/red options with very different story implications.
i wish making these important choices was a little less obvious
so people would more naturally make the choices instead of wondering what the implications will be later