Board Thread:Show-Related Questions and Answers/@comment-24301813-20160926205826/@comment-61573-20161110192421

Actually, she makes him back off when she doesn't have the combined power, when it's just her. And also, before the mirror is complete.

Hyde may not be able to killed, but being beaten is a separate matter. Marshmallow has the size advantage, no matter how strong Hyde is, he can just be picked up and thrown away. Or impaled over and over if Marshie is feeling particularly aggressive.

And no, Hyde is not immune to physical damage, nor conventional weaponry apparently. Hook stabs him in the back and it causes him pain. Then Snow zaps him with a taser and he gets knocked out. So being stabbed with ice spikes or being incased in a block of ice several meters thick would definitely hold him. And if the ice spikes were made to continually regenerate, which does not require sustaining from the creator, Hyde would heal just to be injured again.