Umm, unfortunately...
The debug file is quite large, about 38.6 MB. Attaching this debug log is impossible.
But then, I compressed the file into zip format and it worked quite well. The file attacher wouldn't handle 7z files, so I made that instead. It would have taken me up to 45 minutes to send off this debug file without compressing it.
An update: This is definitely a bug in Defraggler. Even though I still saw the MFT region marked purple on the disk map, when I looked at it through another tool, such as O&O Defrag, I saw that the entire free-space region was completely covered in data! I'm trying my best and using all these other tools to help restore order and chaos before my next reboot...