Ofelia and Crazy Dog quickly learn that theres no air coming through the vents.
If they kill off those whove already been bitten, they can buy themselves a little more time.
They even find a box of morphine and syringes to put them all to sleep.

Credit: Richard Foreman, Jr/AMC
Actually killing them, however, is another matter.
Its even harder for her to talk them down as they beg and plead for another hour to live.
Its nearly impossible for her to be the one to actually take their lives.
She has always felt like a consolation prize to her mother.
she asks the first to volunteer, an elderly man from Black Hat.
Its more a question to herself.
An older woman comes to her side, not to console her but to ease her back into focus.
Those people who are prepared to lay down their lives have done their part, she says.
Its now time to do hers.
Thats the curse of being a survivor, of being the strong ones in this world.
Death will come over and over again to take your friends and loved ones.
Its up to you to decide whether to keep going.
But Alicias hope is dwindling.
Its gonna be okay, she tells a whimpering Blake, who asks forgiveness for his past wrongs.
Outside, Nick doesnt allow Troy time to bury his brother because theres no time to give.
They fire off an initial blast as a distraction.
They crash and are forced to head for the helicopter.
Time is running out.
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He believed 9/11 was the sign of the end times.
After Jerrys death, Christine mourned the life she could have led.
Instead of hiding from the world on the ranch, she couldve explored it.
She wants Alicia to promise never to make decisions out of fear.
A sound catches her attention.
Much faster than Alicia in her weakened state.
The attack, though brief, is a nail-biter.
As she falls asleep, others in the pantry begin to rise.
Alicia snaps awake as the oxygen comes back and shes surrounded by walkers feeding on everyone else.
An explosion from outside rips through the air and shakes the ground as she makes a last stand.
Theyre now planning to head to the dam.
Madison and Walker reveal to Ofelia that her father is still alive and asking for her.
Alicia, however, isnt going.
Why do people keep making excuses for him?
Side note: I made it halfway through the episode before it hit me.
Travis died at the beginning of this season.
Still, I havent heard the name Travis uttered in a long time.