Raze's fingers were locked into the flesh of Mosak. His Dark Magic was already wreaking havoc inside his body. It was beyond the situation where he could reverse what he had done unless he had Light Magic at his disposal.
The issue was that, with how much affinity he had gained with Dark Magic, it would be an almost impossible task for him to gain any affinity with Light Magic.
Regardless of all this, Raze stopped for a moment. Defeating opponent after opponent, beast after beast, and after learning the Demonic Extraction technique, Raze had used it as one of his main methods of growing strength.
Typically, there were two differences with Raze. One was that the extraction technique didn't work as well or as powerfully when used by others compared to Raze. He himself didn't quite know the reason for this.