How can you be sure? Excali-beam is an attack just like Nine lives. Look Shirou use the slab of stone and still is still capable to kill Black Berserker. And that piece of slab stone doesn't have the rank of noble phantasm whatsoever. It only hurts the servant because berserker is the one holding it and swings it around. And the reason why shirou can use that slab of stone and kill the servant because the weapon "memorize" Berserker strength and movement in other words Shirou is a fake berserker right now and so that's why he can still other servant with that slab piece of rock.
If Nine lives attack rank retain despite being executed with legendary bow that kill Hydra in consecutive shots to that traced slab piece of rock used to vanquished a weaker version of Heracles, why not the rank of Excali-beam attack executed with an almost perfect copy(-1 rank version) for the sword?.
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Emiya Shirou,the Counter Guardian.
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