[Another person can see him! Jack is just grinning and looking all kinds of excited, which helps distract him from thinking about the state of his home, but it'll come crashing back later. He's practically bouncing on his heels.]

Humans have never really seen me before, this is kind of a first. I guess that furball was right though, people can see me here.

I don't know about dream worlds, but they can fight using dreamsand, so I guess that's not at all the same actually.