I agree with honestmistake here.
The description specifies that you loose the hero.
The hero doesn't just shout command. He has a suit of messengers with him that carry the commands to the units. I cannot imagine those messengers being thrown out of the baloon

However, the idea of "bricks of command" is hilarious.

As to giving orders to the flyers: I believe the idea here is that they're not in the air for the whole time. So the messenger with the command reaches them while on the ground. The further they are, the harder for the messenger is to determine where to meet them (as they are flying around), and at 20cm, it becomes nearly impossible.