What If? What if Jamie didn't notice Bran?

[Buba]

If the pretty Lanister goes out the window Cersei loses her mind and gets killed too.

This.
Robert "Uhappy Hippo" Baratheon will tear her apart like a wishbone.

 

[Agent23]

This.
Robert "Uhappy Hippo" Baratheon will tear her apart like a wishbone.

Or he is distracted and still drunk and she manages to get in a luckily hit.
Preferably to the groinnoe the stomach.
Oh, sure, he will smash her to bits right after, but that is killing two birds with one stone, got to get the blood pumping to spread the poison and all.