The lions look like juveniles and one of them hesitated when the hyena turned for a second. If they were experienced older lions they would have went for the kill and the hyena wouldn’t live to tell his story.
Just to clear things up, those lions are very young and we’re most likely practicing. They wouldn’t practice if it were a spotted hyena.
Depending on the subspecies the lions had the spotted coats of adolescents and thus a bit inexperienced about life overall.
They didn’t miss anything. Just that the first lioness that caught it wasn’t really interested in the hyena. It knows it’s another predator and therefore not a meal.