MangekyouX said: if he is contracted to saber at that moment he could handle the preasure from all of it thx to avalon
The problem with having the Garm and Unlimited Blades works at the same time is as follows: EMIYA and Shiro's reality marbles are based on separate concepts of the same ideal. As such, when Shiro had EMIYA's arm, he was unable to deploy the Realty Marble due to the fact two conflicting forms of it existed.