Kopa got Vitani unstuck/Kovu's betrayal/Ambush/Zira tricked Simba/Nuka's death

Here is how Zira tricks Simba about Kovu in Jiminy Cricket and Simba's Pride.

Soon enough, Kovu and Kiara called it a night for another beautiful day.

Kovu: Good night...

Kiara: Good night.

Kiara walks off to the main cavern, after looking back in Kovu's direction and sighing dreamily, and Kovu goes back to his standing stone on the promontory. Simba appears in the direction Kiara is walking, and he approaches Kovu.

Simba: It's... kinda cold tonight, huh? Come on.

As for Vitani watches from a distance, the two lions make their way back into the cavern.

Vitani: (hushed, to herself) Get him! What are you waiting for? Kovu, get him!

She lies down and stares with despair, she realizes Kovu is not going to attack Simba. She hisses and jumps up, rushing back to report to Zira.

Just as Kopa spotted Vitani rushing back to the Outlands, she got her hind leg stuck on the hyrax burrow.

Vitani: