The Appearance of an S-tier

Qin Feng did not leave immediately after he had helped these people settle down. Instead, he prepared an ambush around the fort. 

The fortress was like a beacon in this world, beckoning any human survivor to venture to it. When the Gorefiends saw the humans running in the open, they would chase after them to the fort. Qin Feng, naturally, would then kill all of the pursuing Gorefiends.

To the humans, this fortress was the only safe place they could go. To Qin Feng, this was the best hunting ground. As long as he remained here, Qin Feng could keep on killing the Gorefiends.

Of course, the Gorefiends were growing stronger too. They only needed blood to keep on growing. And when the world collapsed, most humans that were stranded here were merely civilians who had little means of defending themselves. In a few quick strikes, these humans would die and bleed out a lot of blood. Hunting these weaklings was the Gorefiends' quickest way to grow stronger.