1)
What is "Chadar ha'Mitos"?
1.
Refer to Melachim II, 11:2:3:1-6.
2)
In Melachim II, 11:2 it says that Yehosheva 'stole' Yo'ash in Chadar ha'Mitos. Here it says that she hid him there!
1.
Radak (Melachim II, 11:2, based on Targum Yonasan): The verse is abbreviated; it means that she 'stole' him among those killed, and hid him and his wet-nurse in Chadar ha'Mitos.
2.
Malbim: Chadar ha'Mitos is the room where Bnei ha'Melech were on their sick-beds after Asalyah poisoned them. Here, Ezra explained that the place where Yehosheva hid Yo'ash was also called Chadar ha'Mitos, due to the episode.
