[solo013]

This method doesn't work for me either. No matter what I try I cannot stay in the center of the bridge, and if I try to I die within 5 seconds of the scene starting.

I tried running opposite sides of where he was and shooting at chest and head area and got right to the end but then boom it fades out and restarts.

After several more tries I figured it out. Once you start shooting do not let go of the button until he automatically stops shooting. Let the spells aim go all the way as big as it will go, and aim for the neck area. Also, try to stay where you have a clear view of where he's at, and as soon as you can shoot again let it fly.