At least he did his business outside of Conn, props to him for that.
The kidnapping itself though was the equivalent of writing an engagement notice while your supernova projectile is already on its way to a shieldless target. Not very cool, probably against the rules and definitely unsportsmanlike.
To be fair, this was before people discovered the abusable combo of JD + Cloak and introduced rules to prevent that. This was within the rules back then, but it would certainly not be today.