http://www.egscomics.com/d/20020507.html
This was, what, the second hint we had about the incident between Sarah and Tedd? Third? Anyway, come to think of it this doesn't make for a very good noodle incident as the information received at this point is already enough to get the basics of what happened. I believe that by this point it was established that:
1) Tedd did something to Sarah.
2) Sarah has had experience with somebody being something other than human.
3) It happened while Sarah and Tedd were working on a school project together.
4) And now it's been established that Tedd has a ray-gun that transforms people into half-animals, and that Sarah hates it.
Sure, the details may still be missing, but the basics can already be deduced without too much effort. Of course that may just be hindsight talking.