My theory on this video is that the whole Pompeii theme is representing the real world, because the ancient Romans believed that Pompeii was buried in ash because the whole town was full of sin. Now, the people with black eyes represent evil sinners and since he is running from them he is trying to escape from the sin and stay in the "everything is fine fantasy land" that he has created. But eventually he succumbs to it and gets black eyes himself, representing that he is accepting that everyone and everything has sinned and will sin in some way. Also, there are lots of other things referencing the real world and Pompeii in the video, like maybe when he is talking about black clouds he is making a link between the volcanic clouds and clouds of pollution.