Oelm
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2Invis: In my opinion, only a deliberate attack with reinforcements can be considered a red rush. If you attack in a teleport, then IMHO, it's not a red rush at all. You're the one to blame.
Regarding multi-defeat, my suggestion is to allow attacking with the same hero as many times as you want. If you attack with a different hero, then you must fight to the end.