User blog comment:NerotheHedgehog/Skyrim/@comment-1658053-20111202000258/@comment-1349273-20111202153747

There's a very easy way of killing giants as a spellcaster though. Run away from them and cast a spell, then sprint past them. They'll do a running overhead swing, but will miss you as you run underneath them. Just make sure you have enough stamina to sprint.