Why would you want Slag's mark to be nullified? How does his rabbit tripping a competitor affect the quality of Slag's performance? Sounds like you are just looking for a reason to take his sub 4 away!
Reading comprehension, I surmise, is not your forte as I wrote about Slagowski's "great mile run." But I asked because I wonder if there are any rules that could impinge on such a situation.
One may wonder why, say, years after the fact, Penn State football victories were forfeited because of Jerry Sandusky's horrible crimes. Please don't reply that I wish to see more of such crimes, challenged reader.