Board Thread:Spoilers!/@comment-5899967-20150208192922/@comment-25926288-20150421012952

Utter solitude wrote: Hopefully they use it more as a catalyst than the reason Emma turns "dark".

She's already stressed, hurt and angry (she constantly looks like she's been crying) and killing someone, even though she was justified, is only going to weaken her more. I agree. From an interview or quote, it seems like they saw it...well, I'll post the quote:

“The audience should be very, very concerned that Emma has irrevocably headed down a path” — and not one dappled with sunshine and flanked by singing bluebirds, series co-creator Adam Horowitz told TVLine as part of our May Sweeps Preview special. http://tvline.com/2015/04/19/once-upon-a-time-season-4-emma-kills-cruella/

Didn't seem that bad, but hopefully they'll address it next week and won't skip an episode to discuss it.