Okay!  I got an idea as to why the two don't like one another.<br/><br/>You're working vice (you're a police officer, so I assume you're more like a detective?), tracing this serial rapist in New York City.  Turns out, serial rapist is an ambassador to South Africa.  You make the arrest, maybe rough the guy up a little bit, but then the Kid stops you.  Since he's such a stick in the mud, the Kid informs you that he's an ambassador and he's got diplomatic immunity.  You watch this guy walk free.<br/><br/>Doesn't stop there.  Later that night/week/month, you decide to show him what justice's all about.  However, you run into Kid Arrow again!  He's actually protecting that scumbag.  Arrow's resistant to actually squaring off with you, but you manage to land a few solid punches before the authorities arrive.  Still, they're a bit late;  you manage to get away instants before they get there.