Hey, I apoligize if this is a repost. I just wanted to get out of this leecher rank.
Theory:
Disconnecting your party member by using the "Reset instances" tool.
How to:
When your party member is about to jump into the instance, hit the reset button. If you make the timing right, he will get disconnected. I tried it a few times in SM with my pal and it worked all the tries when I got the timing right.
When to use?
Use your fantasy. Maybe you want to get rid of an instance member without kicking him without a reason. Disconnect him and then kick him for being DCed. Might sound lame, but just an example of what it could be used for.
Anyways, sorry for being a leecher and if it's a repost.