Arya and the recruits arrive at what must be Harrenhal. I mean, it looks a lot like the big pointy castle from the opening credits and also that's where the gold cloaks said they were taking the prisoners. I hear it's cursed. Gendry, Hot Pie and Arya look at it and Hot Pie asks what kind of fire melts stone. I will be honest and say that I did not notice any melted stone, but if Hot Pie says it's there, I will trust him. Arya says that the answer is Dragon Fire, which I happen to know is also a great way to cook chow mein noodles. That's a reference to an early Muppet-themed commercial, which I highly recommend you seek out on YouTube. If Daenerys's dragons grow up to be anything like the La Choy Dragon, we're in for some good times. And if the budget for future seasons gets cut, I wouldn't rule it out. Hot Pie also wonders what the bad smell is and Arya says it's dead people.
There are many prisoners in shackles. Which makes sense, because you see very few free people in shackles. There's also a lot of screaming. There's an old lady staring into the distance, listening to the screams. I can't help but imagine the recording studio where some poor voice actors had to spend hours screaming. Actually, that sounds like fun, assuming you get lozenges or something when you're done. The lady says, "He's dead. He was my son. My sister was three days ago. My husband the day before that." They take someone every day. Arya asks if anyone lives after being "taken," and there's no answer. Hot Pie is freaked out.
Everyone's chained up in an outdoor cage, so they can get rained on. Arya's on the ground, muttering the names of people: "Joffrey. Cersei. The Hound. Ilyn Payne" And so on. Ilyn Payne was the executioner who cut off Ned's head. I assume these are the names of people she's going to kill when she gets out. It's good to have goals. It's also interesting that she's coincidentally considered the riddle that Varys posed to Tyrion. Who's responsible for the executioner's actions? Arya doesn't care. She'll kill everyone who might be even a little responsible.