Not abuse, don't sweat it. Valve specifically left this bug in because they found it hilarious, and it's impractical and difficult to do.
Yea I thought so, the timing is pretty hard, but when you get it.. oh man it's funny. They were pretty hard to pull off, specially since I'm not in a clan/team or anything, was just me and my friend.
I wonder if Valve takes the additional info can enter into account. So when people report for abuse it can be disclaimed. Same for other fake reports.
Edit: Also my Dota 2 Test updated with another 7.4 MB download again, probably nothing though.