******Spoiler Alert - College of Winterhold Quest**********
Originally Posted by barto
I killed the other 2 guys first because i wasn't able to penetrate his shield until the other 2 guys were dead. Granted, i only tried to slash through the shield a couple times and it didn't work, so i changed my strategy. Once i disposed of the other 2 guys i used slow time and a two handed sword littered with Firebolts, followed by restore health after i had been hit by his lightning attacks. I also used the Scroll of Call to Arms.
Yeah, you have to kill the two other guys first or you can't get past the shield.
It must have been the lighting I used that drained his magicka so that he could not summon the storm antorachs. I was also wearing the amulet that gives you 100% faster magicka regeneration so that may have helped me have the magicka to use the chain lightning on him.