"Run! The second strike is coming..."
The few surviving cultivators, regardless of anything, fled from the gap in the city wall. The moment they left the city wall, the strange sound disappeared. The Crossbow Demon did not pursue. Franklin found an angle from which he could see the entrance to the gap from outside the city wall.
The Crossbow Demon pushed piles of broken bricks out of the hole, resealing it!
Even the well-traveled Franklin was dumbstruck. He immediately reported back to Tamsin Macy, "Your Excellency, it appears the Demon Beings of this world are these magical instruments. They possess intelligence and seem to strictly abide by their respective, uh... duties. Like this crossbow, it was likely once one of the city's defensive tools, so it still guards this section of the wall tenaciously. Those who attempt to cross the city wall will be attacked!"