This is true. I suspect that they also had people stand on the walls at key points to deter wall jumping escapes. That said... given appropriate materials (eg

This is true. I suspect that they also had people stand on the walls at key points to deter wall jumping escapes. That said... given appropriate materials (eg flexible wooden rods for hurdles and fences)... Pens within the kite seems pretty possible. Idk if they had a reason to pen animals... but even giving yourself more time to process meat might be reason enough. Some US "buffalo jump" sites and accounts suggest a lot of waste. Processing a bison is a lot of work. If you want 20 people to turn 50 camels into dried/salted/processed meat efficiently... you need a few days. Meanwhile... a handful of kids standing on walls could probably contain a herd in of these kites for a few days, even if it couldn't contain the herd without supervision. Also... They had ropes and such.