No, indeed, we do not. It was highly irregular. I did meet with Madam Hooch before we departed and she confirmed that it had been tampered with, but she is of the opinion that the spell linking it to Harry was beyond the ability of a student.

I do not know whether an increased MLE presence at the school is warranted, but of course it shall be as Our Lord wills. Meanwhile, Rodolphus' opinion of the bludger may be of great assistance in tracing the source of the threat.