1)
What is the significance that his skin blackened and his bones dried?
1.
Malbim: His skin blackened like a Tanim, and his bones dried, as if he was an ostrich, which dwells in hot deserts.
2)
What is "Charah"?
1.
Rashi: It is something that Necherah and dried due to heat of fire, like "Nachar Mapu'ach", "v'Socho Nachar."


