Looks like I was right - the blade-tip went forwards, and sliced through the cowling ring, eventually destroying the entire cowling (and then hitting the wing-root). There was a lot of push-back to this explanation here, but it has been known as a possibility for decades.. Indeed, the only fan-failure I have had, left impact marks all across the front cowling noise suppression ring.
Unlike the whole blade, the tip has much more forward force on it and a lot less weight, and it can easily spin out the front of the engine. And it appears that this is what happened.
Take a look at the Blancolirio channel.