1)
What is the meaning of "Lero"?
1.
Rashi: It is Leyirah (to fear).
2)
Why did Sha'ul's fear of David increase?
1.
Radak (28): (a) He saw that Hashem is with him. (b) Michal loves him, so he cannot kill him via her. Also, if he speaks in his house about killing him, she will tell David.
2.
Malbim: Now he did not fear him only at times, rather, all days.
