Melissa didn't continue to kill demons. Because when the Demon Clan retreated, Ruthless, severely injured, was on the brink of death. Remembering the task Sky Scar gave her, Melissa immediately stopped slaughtering the demons, flew next to Ruthless, protected her under her wings, and quickly escaped to a far distance. At this point, the battle was determined; it was impossible for the Demon Clan to turn the tide.