caused by one of his art display

Well, no. It turned out Eric was indeed having seizures... caused by one of his art display lights strobing. The effect was causing him to have a seizure while staring at the light. Good thing for Eric, because the only cure he needed was to change his light bulb. As for his back,

The Legend of Korra Episode 9
True Blood Season 5 Premiere
Legend of Korra Episode 9