[Jack's impressed with the light show, a look of awe on his face. It does sound a little bit like what the Guardians were saying about their centers. He nods and finally finds his voice.]

The other Guardians...the mentioned something about their centers being what they protect in children. Wonder, Dreams, Hope...that sort of thing.

[Jack hesitated, looking down.]

North asked me once what mine was but...I haven't figured it out yet. I'm not sure if you can be a true Guardian without one. All the others seem to know what they're doing after all.

[He doesn't mention that, while he's here, he's not even sure if the other Guardians are even still around. He'd fallen asleep at one of the most terrible times he could have thought of and there was nothing he could do about it now.]