Outsiders "magicaly" apper back on ledge?

When I was watching SP I saw this error. When Zira and the other Outsiders ambush Simba and Kovu. When the outsiders attack Simba, they fall odwn a rock:
Then after Simba falls, then Zira(Meh angel XD) says "Yes, we got him!" Then, the outsiders who attacked him slide down the ledge!
I am confused
Then after Simba falls, then Zira(Meh angel XD) says "Yes, we got him!" Then, the outsiders who attacked him slide down the ledge!
I am confused
