Guarded walls can't protect you when the threat is coming from inside.

After members of the ranch are poisoned, they start to turn; and the once-safe community is overrun with Infected devouring their friends and family.

In this talked about scene, the ranch descends into chaos and Nick realizes who's behind it all.

Watch the Talked About Scene From Season 3, Episode 7, “The Unveiling”

Ofelia uses the distraction as an opportunity to make a run for it, prompting Nick to realize she's guilty and Madison to give chase.

Click here to see what happens next.

Fear the Walking Dead returns Sunday, September 10 at 9/8c on AMC.

Watch the first half of the Mid-Season Finale now on amc.com and AMC apps for mobile, Fire TV, XBox One, Apple TV, Roku and Chromecast.

The second half of the Mid-Season Finale is also available now on amc.com and AMC apps for mobile, Fire TV, XBox One, Apple TV, Roku and Chromecast.

To receive talked about scenes for each episode and more exclusive videos each week, sign up for the weekly Fear the Walking Dead newsletter.