The rhetorical question that begins with the words "Can you hunt" in verse 39 ends here. This can be translated as a statement. "You know that you cannot hunt down ... when they are crouching ... to lie in wait." (See: [[rc://en/ta/man/jit/figs-rquestion]])
The implied information is that the lions are hiding and waiting for their prey to come near. Alternate translation: "to lie waiting for a victim" (See: [[rc://en/ta/man/jit/figs-explicit]])