I think narratively it makes sense that hes looking for the summoned heroes. It could be some kind of object as well but if we presume that the whole orc thing was a trap to lure the human forces in it makes sense that hes disappointed when none of the heroes showed up.Was that demon searching for otherworlders? or for something else?
No, you need a bigger bomb.We gonna need a bigger/better gun.
We need nuke, and launch it from the orbit.We gonna need a bigger/better gun.
imo, it's a good time to introduce the demons but the demon "servant" obliterating knights and adventurers like that is just too much of a power creep.Also, having demons that are that powerful kind of throws off the power balance in the story.