It's tough to see it from the other guys side but they could have been killed if they hadn't protected themselves in this way, the volatility was ridiculous and they wouldn't have been able to outright hedge in that sort of market.
But look at the momentum, you could have got a directional in any time in the following 3 hours, scalp or not, and made a few buns.
If you'd been long on vol going into that you wouldn't have cared which way it went and although the rate cut wasn't expected, it wasn't totally off the radar and the ABS was the least well kept secret of the week, not specifically the detail but that it wither would or wouldn't get mentioned. Either way it was going to spike vol.