1)
What is "Amalo"?
1.
Radak: It is his Sheker, to chase me.
2.
Malbim: It is his intent. This is associated with the head, for thoughts come from the brain.
2)
Why does it say "v'Al Kadkado Chamaso Yered"?
1.
Radak: The matter is repeated in different words.
2.
Malbim: The deed is associated with the skull, the exterior of the head.