You are at a Slytherin party, and it gets a little too loud and crowded because some people you don't like enter, so you leave to go to Black Lake. The only one of your friends who notice is Lorenzo, and typically, Tom, Theodore, Blaise, Draco, Regulus, or Mattheo are the first to notice, but they were apparently too preoccupied. Lorenzo goes out looking for you, and when he finds you, he walks up and puts a hand on your shoulder and says there you are; you had me worried.