On Angel Island (Which isn't a floating island for... reasons. It stops floating before Knuckles' Time), Knuckles' father asked him to guard the Master Emerald for the day for training. He is bored and has too many thoughts running through his head.
Knuckles: I know it's my duty and honor to do this, but who is going to get this island? The seas are rough, so the only way to get her is by flying or wrapping. Maybe I should research why the island stopped floating years ago... What the-?

Knuckles notices someone with big ears getting close to the altar.
Knuckles: Her again! Thought she was smart not to show up again!

Knuckles burrows underground to catch his intruder off guard. Instead of a stealing bat, meet a wild cat named Carol Tea. Carol barely dodges Knuckles' attack. Without any words, the two started fighting. At first, Knuckles was only fighting her to protect the Master Emerald, but he started having fun because he saw Carol as a great fighter.

After their brawl, Knuckles and Carol are lying in front of the altar, all bruised up.
Knuckles: Had enough?
Carol: I was going to say that to you.
Knuckles: You're not going to get it.
Carol: Get wait?
Knuckles: Your serious right?
Carol: I don't know where I am right now.
Knuckles: Then how did you get here?
Carol: Boat.
Knuckles: Ok. Another question.

After they talk for a while, Knuckles gives Carol some warp rings so she can go.
Carol: That Knuckles guy is strong. I can wait until our rematch... He never said what is he guard.

Thus Carol and Knuckles are now sparring parthers.