Board Thread:Spoilers!/@comment-6036560-20130509002105/@comment-8954026-20130511162829

Princess Alessandra wrote: Okay, if I had to hazard a guess at to what was going to happen in the Regina clip (which I thought was BEAUTIFUL) We are shown in the sneak peek that Emma runs off, seemingly leaving Regina to slow down/stop the trigger but I am guessing she doesn't get far and turns around and uses her magic to help, thus allowing Regina the chance to live.

I did think that too for a little while but from the original sneak peak though, the one with the Charmings, I don't think that will be the case. When Henry asks where his mum is, Emma gives MM that look that suggests - 'We're letting her sacrifice herself'!! That's not to say Emma doesn't go back and help Regina though :)