When they saw the direction the young man was pointing in, they were pleasantly surprised because they clearly saw the black flames on the ground spreading.
After expanding to a certain area, the flames at the edge had already touched the zombies. What they saw next made them very happy.
That was because those flames were all attached to the zombies' bodies. Not only did they burn the zombies, but they also quickly continued to spread.
The black flames seemed to be hunting. They kept attaching to all the zombies nearby and began to burn. Then, everyone saw those zombies turn into skeletons.
A large number of skeletons wrapped in black flames did not make them feel that they were terrifying at all.
On the contrary, it made them feel more at ease because these zombies had become motionless after turning into skeletons.
It was obvious that the black flames had destroyed those zombies, giving the group a chance to survive.