Talons Ult Blades and Stealth

Support main here <- and in spite of sounding like a noob I have to ask this. Will Talons Ult blades reveal him if the enemy has no vision of him? That is, if Talon Ults from the brush will the enemy see his blades coming out even though they have no vision of him? If the enemy can see his blades without vision of him, should it really work like that?
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