Talk:Blitzcrank/@comment-24636938-20140726133804/@comment-24464243-20140810030959

I believe the distinction is mostly for the sake of how the damage interacts with attack modifiers - it's not 200% damage on an attack, it's 100% of your AD on top of the attack. So, for example, if you critically striked with the same attack, you'd deal 300% damage from 100% damage on an attack multipied by 2 from crit plus 100% of your AD as bonus damage, rather than 400% damage from 200% damage on attack multiplied by 2 from crit.

Not especially relevant in most contexts, but there to prevent abuse cases where Blitzs bursts you for 500% of his AD with an IE.