1)
Was David already caught in their net?
1.
Radak: No - but they think that they already caught me and I cannot escape, like Zifim said "v'Lanu Hasgiro b'Yad ha'Melech" (Shmuel I, 23:20).
2)
Why does it say "Reshes Zu?
1.
Radak #1: Their net was known to all.
2.
Radak #2: "Zu" is like Asher (that they set for me).
