Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding General Pointsound and PointsoundDummy

I was watching how the Lady Vengeance level is made and for the squeaky lamps sounds you have some triggers: 2 random lamps in the whole level are Pointsound, while all the rest are PointsoundDummy. I don't understand the difference or why this is made like this. Someone to enlight me, please?