1)
What is the meaning of "Liros ba'Mistarim Tam"?
1.
Rashi: They cast at him with their arrows.
2.
Radak: David discusses himself. He went simply and did not harm one of them.
3.
Malbim: They suddenly shoot arrows at one who is Tam (unaware of what they do) ba'Mistarim (covertly).
2)
Why does it say "Yoruhu"?
1.
Radak: They suddenly shoot arrows at him. I.e. he is like one at whom they suddenly shoot an arrow; he did not guard from it. So I did not guard from those who slander me to Sha'ul.
3)
Why does it say "v'Lo Yira'u"?
1.
Radak: They do not fear Kel, who sees them.
