you were an assassin but also friends with Thomas Jefferson....what a coincidence that you have to assassinate him. You didnt want to but you knew you had to so now you were at the ball dance watching everyone because this is where you would do it....unless something happens to change it...and he didn't know you were an assassin...

thomas: yeah and he said "blah" "blah"

he was chatting with a friend in the middle of the ball.