Just a random idea I had. When Marle disappears, it's because the atoms that make her up exploded all over the place to where they would have been had Marle never been born. That flash? It was a Luminal Boom, the light-based equivalent of a Sonic Boom. Let me explain. TTI may not have been violated completely by Marle's banishment. It is generally accepted that she was banished to the DBT, but I question that. While Lavos as the Time Devourer was able to continue it's awareness(In my opinion, due to a creative application of the Pocket Dimension.), it is utterly inconceivable that Marle would be able to do the same. I therefore submit that she was
not sent to the DBT, but was rather stuck in a limbo in the Prime Universe, thanks to TTI being slightly stronger than we suspected. TTI as I believe it to work
does not preserve spatial coordinates of all atoms in a Traveler's body. Rather, it establishes a Causal Link between those Atoms. This link ensures that no matter the distance of the atoms physically, information(heat, inertia, etc) can be transmitted between them with 100% Fidelity and 100% Efficacy. Basically, while the Atoms that made up Marle were separated by space, they were still connected through time. Let me Illustrate.
Get it? Marle is bunch of dots in three dimensions that make a concise whole. After the event her atoms are separated in space(2D) but if you add time(3D) then rotate it, you will see the connection.
NOTE: I am not implying space is Two-Dimensional, I am simply linking the textual explanation to my diagram. Just so nobody starts a post with something along the lines of
.
Finally, the Luminal Boom is caused by her atoms moving to the redesignated locations at infinite velocity.