User blog comment:SirAston/Arn, the Lightning Leg/@comment-5514182-20130801005311/@comment-5331854-20130801091628

Thank you for your comment.

I wanted him to have similar traits to Rumble, who excels in Danger Zone, but also benefits from his risky, overheated state when used well. But as an AD (and the fact that Overheat hurts him with every attack), he needs to have more control over his heat, hence the E. It just adds another layer of strategy for him, as he's weaker outside of Danger Zone (He can build up with Q, but that makes him predictable if not used with care). Plus, Emergency Release has a very high cooldown at lower levels to discourage spamming his skills early, so I think I am on the right track with this kit. Judging from the comments, I'm not the only one thinking that way about him XD