I'm in the boss battle fighting Young Xehanort and I was just there fighting him and all of a sudden he left. Like, he gave some kind of laugh and then left. I thought it was a normal part of the game and he would come back with some huge combo attack but I've just been running around the fighting area waiting for him to come back. My dream eaters are kinda just running around and I have no idea what's going on I mean is this normal I've been to every corner of the area maybe looking for an action command or something but nothing I've been running around the place for like 10 minutes hELP
Whats supposed to happen is a giant clock appears in the middle of the stage that you are supposed to reality shift. What you have sounds like a glitch and I have to regretfully inform you a restart of the game would probably be your best bet.
The only way to reset is to turn off your game and boot it back up, right? I don't think you can just leave the battle. Probably just a glitch, because even if you didn't react to the time portal he should have revived his HP.