I would rather think she (she meaning Eva) doubted that Negi could beat ChaChamaru anyway.
Ps: just read (well looked and scanned thru it in a more of a sense) chapter 74, and Sayo is rather cute like sarcasteak said. She looks a lot like Tsukuyomi. Who happen to be my favrite girl character in Negima.
"She's so cute and innocent isn't she, Kyaaaa ^_^"
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