There's definitely a relationship there! It's almost like a... spiritual link? A rope made of light, or whatever metaphor works there, connecting Windy to the Song.

It's pretty.

He tries to look at it more closely.

It gets magnified and more detailed. Having Windy around calms Song down and makes her more pliant and trusting of Scott, and she sees Windy as both a boss and a grandmother and a bigger sister and none of those things. Windy takes responsibility for Song, and is protective and critical and also none of those things.

He tries looking for a connection between Through and Song.

None.

Through and any other cards, not here with him...

Complete lack of any information regarding any cards not present.

What about him and Kero? Are they connected? Him and Song? 

Mmmore or less. There's a thing, but it's different than the thing between Windy and Song, and harder to grasp.

He tries grasping it-

Nope. Asthma attack.

He grabs his inhaler and drops the staff to the floor.

"Are you alright?"

He gets his breathing back under control.

"Yeah, fine, happens sometimes. Usually not if I don't do too much moving around, though. Sometimes it's luck."

"Oh. Why does it happen?"

"Um. Since I was born, sometimes it gets harder for me to breathe because the part of me that takes in air gets smaller, and it doesn't let as much air in. So then I have an asthma attack, like you saw, because my body is trying to get more air faster."

"Oh. Why?"

"Some people just have bodies that work differently. So I have this inhaler." 

"But you're okay now?"

"Yeah, I'm fine. It might happen again, but as long as I have this, I'm okay."

"Okay, that's good, then."

"I probably shouldn't have one for a while, they're not that common. Unless catching Clow cards is really active work..."

"It will probably be, some of them will run away or be hard to catch..."

"It's not a huge deal. Stiles can help, I have Windy to trap them...I wonder if she could help with this? You said she's not that good with this sort of thing, though."

"She's very strong, but isn't very precise, and none of the cards are very creative."

"Well, I still have Stiles. I'll work on it."

And he walks over to his bathroom door, where the pullup bar has been installed. 

He seems to be quite absorbed in that.

Kero may have to entertain himself.