Attack uncap - more elucidation

Quoted from He Whoth Bag Doth Swagger Fattily:
"You are only allowed to engage uncap if the enemy shoots out (only that player, not the entire team) or if you capture all of the flags. When they start to recapture flags you have to pull back."
Does this mean as soon as the red flag starts flashing or once the flag becomes white from neutralization?
 
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