Eadric's hammer.

I'm confused by puppy's post. While I've not drawn Eadric in a week on heroic, as I recall its a two part effect. The first is Eadric marks the intended target with a debuff. This is then followed up with the hammer hit. If you cleanse the debuffed toon before he gets the hammer off it is automatically reflected on to him. I know I got the achievement for killing him with his own hammer and all I was doing was cleansing with my paladin.

Am I missing something?