Hiding within a cloud was Zach, using his ability to know everything that happened with the Reality Marble that he had created. He had other abilities too, but none were as powerful as Reality Marble, since it complemented Jionerd's ability the best.
Reality Marble worked by constructing a scene of his imagination. If he didn't wish to do that, he could simply reconstruct a scene from reality that he had witnessed. The grander the scene, the greater his energy consumption.
So, he typically created a Reality Marble that was a perfect replica of reality. This way, even if someone ventured into his domain, they wouldn't realise what had happened. And, irrespective of the destruction caused here, there won't be anything in reality.
Unfortunately, he could only do this for inanimate objects. That's why he joined hands with Jionerd whose summons could be integrated into his Reality Marble to create an endless stream of soldiers.