Oh thank goodness she didn't go through with it! That could have been awkward.
That's strange. I have a strong feeling many won't share that sentiment for some reason...
This comic is the result of considering what Ellen would naturally say and do in response to Sarah's question, the potential consequences thereof, and knowing that she'd have enough sense to stop herself.
I know there's nothing particularly exciting about that, but a common question asked of cartoonists is "where do you get your ideas". There is no one answer, but one of them is simply thinking things through to their natural conclusion.
Another is doing that, then wondering further what would happen if you threw in additional variables, such as a kangaroo. Choosing to limit myself to three panels in this comic for reasons of composition, I was unable to include the kangaroo. This is regretable, and I guarantee the outcome would not have been what most would expect, but it's probably to the benefit of the story as a whole that I did not include the sudden interference of a kangaroo.
In retrospect, the sudden inclusion of a wombat would have improved both this comic and the story as a whole, but hindsight is 20/20, and we must press onward.