When your Vayne tells you she wants to 1v5 because she's fed.

Also make sure you watch her every move. You don't want to miss a single vaynespotting point.

Threaten her by saying you'll sell off Ardent Censor.

http://i.imgur.com/D4oSxm3.jpg

[slayer-pantheon-thumbs]

So long, so long and thanks... For all the good feed.

She doesn't tell you. She just does.

Well at least she told you I guess?

Seems just as likely they'll do it without warning.