The line "it comes to you begging you to stop" appears in a pdf file, titled 'mercy', taken from theeraser.net:
Transcript
The song was arranged for solo acoustic guitar while Thom was still working on the recording, and in this form it was played on its few live performances. This recording comes from the KCRW broadcast in late june 2006:
As part of the D&DA Global Student Awards 2007, Radiohead financed the creation of a finished promo for this song, with Thom giving a few instructions (under "Mandatory requirements" and "Considerations") as well. You can take a look at the briefs about the competition here: