Casper needed to wait until the scouts finished all the preparations to start the plan.
He was trying to be as calm as he could be. There was no way to go instead of cooling off and pay attention to everything around him.
The scouts had said to him the positions of the enemies, and he passed the information to the nearest soldier, ordering that he did the same, creating a chain of communication.
That was the most efficient way to pass information by that time.
They couldn't use radios to communicate with each other. The Black Widow had a security system that interfered in their line, making it impossible to reach another person.
"The plan A predicted completely what would happen today. At nights when there is no moon, they prioritize settling some soldiers in watchtowers. Also, they active their lights, and the cameras go to night-mode, so they can spot someone even in the darkness.