Today’s 5-second tactics

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Mujumdar, Sameer
From the recently concluded 8th Philadelphia Open (2014.4.19). Position before Black’s 28th move. Black has a crushing attack on the Kingside while White can do nothing to resist. In the game continuation Black played the reasonable 28…e3!? and after 29.Qe2 (29.Qf3! is lost in anycase, but lasts longer) 29… Bxg3! 30.hxg3 Qxg3+ 31.Kh1 Rf2 0-1
HOWEVER, for the sake of accuracy and as a challenge for my readers, there is BETTER for Black in the above position! It is your task to find it!
WHAT IS BLACK’S BEST LINE?
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8th Philadelphia Open 2014.4.19; Mujumdar, Sameer–Yuvarajan, Prathiba: The best is 28…Be3!! with the theme of Rf1+. After 29.Qxe3 Rf1+ is forced mate in 6, while 29.Rxe3 Rxf2 30.Kxf2 Rf8+ 31.Ke2 Bg4+ and mate is inevitable