Aha! That is a potent retort! ...However, I still foresee complication.
Let us assume for the sake of this argument, that the eraser is not attached to the drawing instrument.
Another simulation provided below.
I rest my pineapple. Er, I mean case.
I for one advise against the use of erasers while drawing reindeers while balancing pineapples on your nose. It is not only impractical, but highly dangerous! Turning that drawing instrument around to use the eraser while keeping the pineapples balanced could prove difficult!
I've drafted a...