reason 4 BR 2 fall 4 raina??

there r should be some reason 4 BR 2 fall 4 raina. first I thought raina will save rakhi but chances r very less, so I guess may be when BR try 2 kill rishab raina saves him , chances r there , or one fine day suddenly BR notice how gorgeous raina is.
what do u choose. plz do post ur views 2