[Rhythm]

Spoiler for Episode 2 @ around 7:55 or so, question.:

Araragi: You mentioned optimism just now, right?
Senjougahara: Isn't that how it goes?
Araragi: Maybe. But being optimistic isn't a bad thing, is it? It's not like you're doing anything bad.
Senjougahara: Not doing anything bad, huh?
Araragi: Isn't that true?
Senjougahara: That's true. But. It may be considered a form of cheating.
Araragi: Huh?
Senjougahara: Nothing.

What did she mean by a form of cheating? What was she referring to?