[Sora jerks to a sudden halt at the voice, as though he hadn't even been aware that anyone was around (much less that he was hitting them), and just like that all thoughts of the Actually Important Matter at Hand are gone. Heartless who??]

Spar? Oh, sure! [...HOLD ON] Wait, no! I mean, um, not right now, sorry. I'm sort of in the middle of--

[--actually, upon looking around, it's suddenly like the heartless just sort of up and vanished. He scans the ground for the telltale pools of shadow, but... there's nothing, or at least not as many as there had been just seconds ago. Aw, man, did he lose them because he got distracted?]

--okay, that's weird. They were just here, I swear!