Board Thread:Show-Related Questions and Answers/@comment-26116863-20151117024202/@comment-25926288-20151117024545

No.

Emma said she was going to use the Promethean flame to untether Hook and to tether Hook.

Merlin is just a normal guy with light in Darkness(I guess) but he can't act on that Darkness or he would become a Dark One.

In simpler terms, if Merlin gave into the Darkness and killed Snow, he would then turn Dark......which should be his fault as he is forced, but that's Once for you! If someone mind-warps you to kill someone, it's all your fault and not theirs.