1)
What is "v'Hitzati"?
1.
Radak: It is igniting. The root is Yatzas. The same applies to "Lamah Hitzisu Avadecha" (Shmuel II, 14:31).
2)
Who is Ben Hadad?
1.
Radak: He was Melech Aram when Nebuchadnetzar destroyed it. Retzin was king when Sancheriv destroyed it.