Besides potentially disappointment I got a question to one thing Heller once said after season 6 premiere.

Heller said:

"Things look very bad for Lisbon at the end of that first episode. What I can tell you is that there is a very cryptic clue in that last sequence of episode one that will eventually explain — when all is revealed — what happened to Lisbon and why," Heller said. 

What is that cryptic clue? I don't understand.

Well, we know what Lisbon happened. McAllister knocked her out and drew the smiley on her face.

But why? Why did he spare her? I don't get it.

What do you think?