Young Master
The next day, a large explosion happened within the city.
At one of the city guard posts when the guards are on patrol, a large explosion occurred which made the whole area crash.
The explosion is of fire element type and everything within the explosion range burned, only a lump of magma and ashes were left behind.
The Night Demon family who are already concerned about the dead investigators, don't know what happened. They don't have much information, they don't know his background, where he came from, and what are his goals in fact they don't even know his name.
They don't know if he is capable of these feats of killing their investigators and causing an explosion within their home ground.
If he suspected him completely and didn't think in any other direction if Sam turns out to be not the person who did all this, things wouldn't go well for any of them.
But they cannot let go of any suspicion either.