Talk:Arthur Pendragon (Prototype)/@comment-36602948-20180902102216/@comment-27971189-20180902132428

No, its definitelty a beam shot from Merlin when he knew that his idol recording moment interrupted as tremor from the giant broke his video camera.

Joke aside, while it depends on Nasu and could be used as excuse to have Sakurai for the third Extella. First of all, Excalibur is said to be 'appeared', when world-level threat recognized (this is how the Grand Saber Arthur / Arturia theory come from);

However it never said yet if the sword belong only to them, there could be another wielder before them as Bryn interlude does notify that she and Valkyries were created from said giant but, just like Altera, all of them did not said if the person defeating the giant is Arthur or Arturia.

Among theories that related to time-travel / dimension travel (some of them thought that the giant will be defeated by Ritsuka and co. at some point of FGO) there is a theory that the person using Excalibur to defeat the giant is Uther Pendragon, in case Nasu following some KOTR lores that saying the sword originally belong to Uther.