Radak: A lion stands in its den, and ambushes to grab what passes by, or [stands] nearby, so [its prey] will not guard from it and flee when they see it.

Malbim: Refer to 10:8:1:1. When the Rasha begins to dwell in honor in his house, he is like a lion in its den. When such a lion sees its prey, it jumps on it suddenly, about four or five Amos. If it does not catch it the first time, it will not return to touch it; it returns in shame to its den. The Rasha is not like this; he always grabs the net to seize the Oni; there is no escape from him.

Radak: This is taking quickly.

Radak (9-10): Now it compares the Rasha to a trapper who spreads his net and stands afar, lest the bird [see and] guard from him. He holds the ropes of the net in his hand. When the bird falls in the net, he pulls the ropes and it is caught. Sometimes a Rasha is far from the road; when he sees the weak on the road, he runs to them. Or, his clan is on the road without weapons. When weak people pass, they make a sign, and he and his armed cohorts come. They are like a net for the trapper. The Rasha guards from people, but not from Hashem; he is not afraid of Him, for he says that He does not see or know (verse 11).