Sounds to me like he missed...
I watched the video he did miss both shots.
They went high.
Instead of backing up he should have advanced on the lion.
Then if the lion did not break and run placed a round or to into the cat.
Over the years I have backed down several black bears and wolves.
Knowing full well I would have killed them if they had not turned and run.
By backing away he only embolden the lion to keep advancing.