Board Thread:Questions and Answers/@comment-25366336-20160107225604/@comment-26253917-20160109073907

Knuckles knocking the Chaos Emeralds out of Super Sonic was PIS since gods like Dark Gaia and Solaris could not do that and so that you would not start the game with all of the Chaos Emeralds.

In Archie, Sigma was only able to knock Megaman and Sonic back.

In Sonic Unleashed, Sonic was in pained after the Chaos Emeralds were removed from his body, it did no physical damage to him as Super Sonic, but he was screaming because the Chaos Emeralds were being pulled out of Sonic.