The Insider.com

I haven't written much about Fringe's heartbreaking decision to kill off Etta (beautifully realized by actress Georgina Haig) in last week's episode, The Bullet That Saved the World, because ... well, it's taken me this long to stop crying.

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Suffice it to say that the brave choice only further cemented my love for this extraordinary, risky, unconventional and simply splendid final season.

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I've also come to understand why it had to happen. Although Walter's brain-scrambling torture scene was enough to make us see why The Observers needed to be stopped, Etta's murder inexplicably linked the audience's emotions to the Fringe Team's success and/or failure.

In the latest amazing behind-the-scenes video produced by the amazing Ari Margolis, it quickly becomes clear that losing Etta wasn't only necessary from a plot perspective, but a character standpoint as well.

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"[Seasons] one, two and three have been Olivia taking those tentative steps," Anna Torv says. "She's a slow burn. Finally, finally, finally to kind of going, 'OK, I'm going to accept and love this,' to Etta then dying." A moment Anna says becomes, "the straw that breaks [Olivia's] back."

And it doesn't sound like Peter will handle the death of his daughter any better. "I just don't think he has the emotional capability to process that loss," Josh Jackson says. "He goes, Man on Fire-style. I think part of him wanted to die when the baby died."

Jaskia Nicole also makes an intriguing point about the Fringe Team's future without Etta in the video above, so watch!

UPDATE! Two new clips from Friday's all-new episode, An Origin Story, were just released!

Fringe airs Fridays at 9 p.m. on Fox.