I'm at the bit in the Labyrinthian ruins where there is a stone that seems to be shooting fireballs at me. There's also a tome for a warding spell provided nearby, hinting that I should be using that. However, even with the ward up, the fireballs still damage the hell out of me and stagger me, making it even more difficult to keep the ward up (which I'm not really sure is doing anything). Am I doing something wrong? It's so hard to even see where I'm meant to be going due to the constant slurry of fireballs being spewed at me.