Go on your friend's Account Page (The Profile Page).
There is a section called Reputation.
If you see something saying REPORT in that section, it means your report was sent.
But you can try to counter the report management, in this way:
Click the REPORT in the Reputation section of your friend, and you will see that you can comment on the report (you will see something like Commenting).
Post a comment in the report explaining what happened (you might even copy paste what you wrote in the forum, above), and i think nothing will happen to your friend.
The idea is to post the comment as soon as possible, until a moderator gets to solve the report.