The Hound brings the box containing the White Walker that he and the rest of Jon's band of soldiers captured in the previous episode into the pit. At first, it seems like the ice zombie has performance anxiety, but after The Hound kicks the box over, Cersei and Jaime get to see a White Walker in the decaying flesh — and it seems none too happy about its travel accommodations. Everyone on Team Cersei is appropriately freaked out, with Jaime asking how many of the creatures are out there (Jon estimates 10,000, at least) and Euron inquiring about their swimming abilities before declaring he's taking his Iron Fleet and heading back to the Iron Islands to let everyone else fight this battle. Meanwhile, Jon demonstrates how to kill a White Walker with fire and dragonglass.
Now that she's seen the threat with her own eyes, Cersei agrees to Daenerys's request for a truce — on one condition. She wants Jon's word that he will he stay in the North and not involve himself in the battle between the queens. However, Jon's honour gets the better of him, and he tells Cersei he cannot serve two queens. Without his word, Cersei takes back her offer and leaves the pit with her allies in tow.