Now that LIGO has demonstrated that two black holes can burp large amounts of energy (in the form of gravitational radiation) in the process of consuming each other, shouldn't we stop saying that nothing can escape the event horizon of a black hole. Clearly, some of the mass energy that was observed in the LIGO experiment was confined by the event horizons of the two black holes prior to their merger. Somehow, in the transition from two separate event horizons to a single event horizon there was opened an escape route (if only for a short time).
I realize that Hawking radiation allows an evaporation of energy from a black hole, but that is a very slow process. Unless I am mistaken, LIGO-like events provide an avenue for prompt release of large amounts of energy.