Say what you will about the level of skill of any other random ability Sora might possess, whether it's fighting or flying the Gummi ship or snatching fish out of the ocean back home, but there's definitely one ability that he has without a doubt managed to perfect in its entirety.

Timing.

It's not one he's been honing intentionally. It's more the result of happening to show up right when someone was about to be kidnapped... or maybe someone lost her heart and he happened to be right there to offer refuge... or heck, maybe he was in the perfect spot right when certain friends needed something to break their fall.

Sora had only meant to figure out if Roxas had the ice cream yet; it'd been a little while, after all, and though he trusted Roxas' ability to defend himself, he couldn't help but be wonder about where his friend had gone. It's what drove him to wander, not unguarded, but not really concerned, either.

And that's when he had perfect timing.

He didn't stop to discern their body language, whether they were about to start fighting or whether they were bet friends, all that Sora could tell was that Roxas was right there, right next to a member of Organization 13, and there was about to be trouble.

They both have keen senses, and Sora's not exactly subtle; either one of them would probably spot him running their way immediately.