Ascent of The Fuckwit And The Protégé as Retreat

Not quite sure how to log this I wish there was just a 'note' non-ascent ascent type. I rapped down this, gave Michael a catch on chicks, then jugged up and was intending to lead this later. Barely 3-4m up I saw a fluff on my rope above, as I got to it I saw core. It's totally shot with 2cm of unsheathed core and bends completely 180. Brand new birthday rope used only a handful of times, and cut almost exactly at the half way mark. Gutted, did not climb at all. Still not clear exactly what cut it and when.