Cloud watches Cayde knowing that part alone could be unreal, unheard of it, but it's the truth. It's not strange for robots to shudder. They probably make a lot of noise while doing so.

"It wasn't exactly easy. Tifa helped me through it. Sort of like this room... but different. We were still inside my mind." He gives a shrug since it's hard to explain. Cloud kept trying to prove himself and it's something he'll continue to do.

He moves his right hand out towards Cayde. He knows how these things work.