The Queen had drawn their attention, and now the Rook was free to move. Striking down, not upon them but a crate just behind Zero -

"Jumpin' Jack Flash!"

- And in the process leaving them all blind for five seconds. The Rook had left them blind and confused, giving ample opportunity for the King to lead the Pawns across the battlefield, whereupon they could surround the enemy and corner them before they even knew what was happening. Five second might not sound like sufficient time, but also remember that they had to regain their bearings, reevaluate the situation, get out of each other's way, wait for new instructions. This left plenty of time for their Knightmares - Sutherlands graciously anonymously donated by the Speedwagon Foundation - to sweep into the warehouse and leave no avenue for escape. Especially with the Knightmare leading the charge being secretly piloted by Lelouch himself.

-Lulu's Bizarre Rebellion Chapter 22