The crystal, being within meanacing appearance hight for a surprisingly fit old homeless guy, is well within ninja leaping range. As the ninja leaps up, announcing his presence to the world, the moon, and probably a few people next door, both look at him, more than a bit surprised. Kitten ears pick up the surprised whisper of "Musa?"
The younger is close enough that mere mortal ears hear it, and looks behind to see his older representation. He smiles broadly, points at the old man and says, "Do I know you?"
The elder's response comes in a quick haymaker. This being on a rather precarious perch, the younger falls off, and the elder begins to go after him as the ninja rises.