Mr. Deflok.. I just found out what happens..
If you don't do the deed, she comes back at the end of the mission trying to put a cap in you.
So, if you do the deed, there is no explanation. If you don't do the deed, it adds a level of "excitement" to the end of that board.
So no biggie, you don't do anything wrong by listening to LAMBERT. If you don't listen to him, it makes the game a little more interesting.
