At the point in time when bullets can pass through the interdimensional walls. When firepower takes up the entirety and eternity of space and time, all beings stuck in a neverending life and death cycle as bullets recover and destroy their bodies in quick succession. No one is able to think about anything but the sheer force of the bullets rapidly flying literally everywhere in the materium turning the warp itself into nothing but a sea of automatic weaponry.. Then there will be enough dakka. Or, at least almost.
Also, In FUMBBL, to deselect a player from blocking, to stop a player from blocking, re-click the player until a popup comes up to [De-Select Player]