Have no fear, Muffin's Theory of Imaginary Time is here!
Okay, there is the "past" and the "future." The timeline is a line. You can describe time travel in two ways: subjectively, "I ate breakfast, travelled back fourteen hours, and then ate dinner," or objectively, "He arrived from the future, and then his previous-self travelled into the past."
However, when the timeline is
changed due to time-travel or a Scratch, there is a second, "meta-timeline," perpendicular to the first one. "Meta-before, the session consisted of John, Rose, Dave, and Jade. Meta-afterward, it consisted of Jane, Jake, and the child-versions of Bro and Mom." Now, we ---
AAAAAAAA UPD8!!!!!!!!