Jann is minding his own business. He is playing by himself in the courtyard with a wooden sword: this definitely constitutes minding his own business. Nothing that follows is his fault.
"Oh, I'll be talking to some girl - there's the magic manticore marionette, it's fun! - and we'll be trying to make plans and she feels responsible for entertaining her friend cousin sister next-door neighbor classmate whatever during the time we'd like to have our date, and then the plans are on if and only if I can find a date for this extra person. It's perfectly understandable. I'd probably have done it myself once or twice if my cousin ever showed interest in, like, company as desirable for things other than chess games and would find it helpful."
"Not yet. He's about your age, some people take a while. Or just remain perpetually confused, I suppose."
"Yes! It isn't as much fun as in person, but it's still fun. Where does your cousin live?"
"The ex-royal ducal castle of Raxwell. I live there too, but he's the actual prince, I'm just his cousin."
"I don't want my life to be quite that exciting. Too much statecraft, not enough swords."
"Maybe I can visit sometime. And be excited about your cousin's castle."
"Sure, why not? You might want to get your own horse if you're going to make international trips like that, though, unless you packed a flying carpet."
"Horse breeders sometimes come around and try to advertise to us, since we're in the market."
"I know a few things. I'm not an expert but I'll help. First rule: don't get one that bites."
"Yep! If you disobey this rule you will find tadpoles in your drinking water for a year and a day. Also your horse will bite you."
"You caught me. That part only lasts a month. But horse bites, ah, horse bites are forever."
"Anyway, play chess by mail with Milo and he'll love you, win and he'll love you more but it will be a snarly love."