As quickly as reasonably possible, I would drain it of all fluids and throw it in the nearest river.
Actually, I am not a mechanic, but I would assume this type of abuse is expected from time to time, and designed into the starter. But, as others have noticed, 3 to 5 seconds is quite a while to notice the issue. I guess it is like, "Where the heck is my hat?" (Ans. on your head) What the heck is that awful grinding noise? (Ans. I guess I should remove my finger from the start button). Sometimes it takes a while for the obvious to kick in.