The problem was that Gotham's local customs were simply too "wholesome"...
Simply put, after being possessed by the evil spirit, this unlucky bastard's first thought was to attack other humans.
But the other Gothamites were no pushovers either.
In the end, the other Gothamites he attacked joined forces to subdue the unlucky bastard, stuffed him into a house, packed the house with a whole lot of bombs, and poured plenty of gasoline over it.
Then they lit it up, setting the entire house ablaze. The flames then ignited the bombs inside...
As for the unlucky bastard possessed by the evil spirit, along with the spirit attached to him, they naturally vanished into ashes amid the flames and explosions.
Although these ordinary evil spirits had no physical bodies and could not be harmed by physical means.
Once they possessed someone, however, they gained physical forms.
During the explosions and blazing fire, the evil spirit tried to leave the unlucky bastard and find another host.
But unfortunately.
These Gothamites knew exactly how powerful bombs were and had already fled far away.
The evil spirit could not find another host, so naturally, it could not escape either.
The massive explosions and flames completely destroyed the evil spirit...
Exorcism Team from Los Angeles
After Constantine and the others learned what had happened here earlier, they all looked at one another.
Although evil spirits had no physical bodies and, in theory, were not afraid of ordinary flames or explosions.
Once the scale reached a certain level, however, a quantitative change could trigger a qualitative one.
In the end, even evil spirits that did not fear fire perished beneath the flames and explosions.
Of course, that level of scale might only be measured by Gotham's standards.
Although the Los Angeles group of four was shocked by