Just reread the battle between Harry, Carlos, the Wardens, Rivershoulders and Listen to Winds, with the Major General coming to the rescue with garlic from PizzaSpress, verses Mavra and Drakul and Company. In that battle Carlos got beat up pretty bad, he was in serious trouble, as was Harry until Toot came to the rescue with the garlic. After the battle Carlos gave Harry a look and a hardness was described in that look. In other words Carlos was blaming Harry for what happened to his friends, or at least that is the implication I got from it. After the battle Carlos wants to go after the vamps and Harry tells him no, they got a bigger battle to fight that they'd get revenge after. But from that exchange I get the impression that Carlos has been brain washed by someone, first hints was the tracking device, and his somehow thinking the vamps was all Harry's fault. In a way I suppose, Harry did give Mavra the book. Anyway, from what went down during that battle Carlos didn't appear stronger than Harry or as strong.