The wounds are randomly allocated via dice rolls (which is a real pain, honestly, but them's the rules). So if they make nine hits that miraculously wound nine times, that's nine armor saves that need to be randomly allocated to models in the unit and resolved.
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Siticus Empyrean Vision - my Facebook page with various painting projects
Siticus' Empyrean Visions log - the project log for my Aeldari works and beyond