1)
What is "Zos"?
1.
Rashi: It is what is written after this.
2.
Radak: It is what he does to me, like it explains - "Im Yesh Avel b'Chapai; Im Gamalti Sholmi Ra" (verse 5).
3.
Malbim: Kush was caught in his own trap. David did not kill him. Many said that David caused his death. Did I do so?
2)
What is the meaning of "Im Yesh Avel b'Chapai"?
1.
Malbim: Even if I killed Kush, was this Avel (unjust), to kill one who comes to kill me?!