This answer sounds plausible. He's found Belle and promised her not to kill Regina, so those two options are out of the way. "Don't know?" well, that doesn't sound all too promising now, does it? ;)

Probably break his promise to Belle but then twist his promise by saying "You said I couldn't kill her, you never said Emma couldn't."

He probably 'will' and Emma WON'T!

^ Exactly!

*Try not to make Hufflepuff joke*

Really good question: I really dont know rhe answer. we will see.....

I think Mr. gold can think of a way to kill gina on his own .. don't know if he will though since he seems to be on evilness-rehab now :D with Belle around and so