That's sort of the entire point of the scene. Much like the scene where Cloud raises the Buster Sword against Aeris, and you can only struggle to a minor degree, while constantly getting closer. Cloud is in a similar position. The kid is his true self, trapped and looking on, unable to stop the events unfolding. A prisoner in his own mind (in fact, being held in a prison he created to hide from the trauma of the events in Nibelheim).




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