Frank at first thought of letting Zazu chase after the cubs alone, but then chose to be kind and help the bird out. He took off running after the cubs, just being able to keep up with them without letting get further away.
Vitani and Kopa ran as fast as they could, and Vitani found it hard to keep running at their pace. But she didn't want to let Frank catch her and to let down Kopa, so she kept running.
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Nala remembered the day she and Simba wanted to go to the elephant graveyard, only succeeding by dropping a rhino on Zazu. "Yeah, Kopa's kinder."