I don't think Raghav accepted the challenge though... he didn't deny it, yes, but I mean, even if he did, what would that do? Mandaar is batshit crazy and I actually think it makes complete sense for Raghav to maintain his composure for now. He has to apply the "calm before the storm" analogy and blow up only when he has hardcore evidence to support his gut instinct.
Filhaal Mandaar has insane sympathy points, so no matter how much Raghav harps against him, nobody will lend him an ear, even his wife. Mandaar is treating this like a game of chess, Raghav has to treat it like a game of poker. & who knows, at the very end when Raghav will win (because we all know he will win), he can have a leg to stand on and say "I never took this as a challenge because Pallavi is my wife, not a bloody trophy". **mic drop** 😎