The wording of Dimension Ripper currently reads:
"When your hero deals combat damage while Dimension Ripper is in play, each player in combat draws a card from the other player's deck."
The wording assumes that when combat occurs, there's always at least two players "in combat". However, Dimension Ripper triggers "as usual" and both players in the game draw a card from each other's deck when your hero deals damage with it to your own ally that attacks your hero due to Rabid Bite or Mind Control, even though in that case, all the entities participating in the combat "belong" to a single player.
Of course, whether there's some kind of bug here, in Dimension Ripper's wording or functionality, depends of the definition of when players are considered to be "in combat", and/or whether Rabid Bitten/Mind Controlled entities "switch their side" for the duration of the effect. Since I don't know the details of what the rules say about those things, I'd hope that somebody in official capacity could maybe shed light on the issue.
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