1)
How did they set a trap for him?
1.
Radak: They set a trap on paths on which he walks, to trap him.
2.
Malbim: They wanted to make me veer from the straight path via a trap that they set on my path.
2)
Why does it say "umi'Pikudecha Lo Sa'isi"?
1.
Malbim: The Pikudim mark the path for me. In the acts of the Pikudim is remembrance of the ways of compassion, Chesed, mercy... Via the actions, the ways of the heart are fixed, and he cannot be caught in the trap - "mi'Pikudecha Esbonan Al Ken Saneisi Kol Orach Shaker" (104).
