1)
Why did Sha'ul need to send new messengers?
1.
Malbim: The first ones were only to guard him.
1
These were to bring him.
1
It says about the first ones "Leshamro u'Lehamiso" (11)! We must say that the messengers were only Leshamro; u'Lehamiso was Sha'ul's intent. (PF)