User blog comment:Kungfuguy27/Professor Oak vs Charles Darwin - Lyrically Adequate Rap Battles of Nothing in Particular/@comment-25872721-20150929024626/@comment-25872721-20150929033153

Did a quick search. Gravity Falls has an episode called Society of the Blind Eye. So does that confirm Hirsch or does that tell me the battle involves a blind guy like Louis Braille? Your extra "hint" just confused me more!