It doesn't work.
That's a 30 second period of time where you propose the invades team should hide and do -blam!-all, while the invading team happily collects motes.
But sure, -blam!-ing just wait it out.
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If they invaded, chances are they sent a blocker or two or you are already trying to deal with them. You are already behind. If your team is way ahead when they invade, hiding from view lures him in and then the team can drop on him at once.