You were trying to worship your ancestors, your altar and offerings set up. This wasn't out of the ordinary for you, as you usually did this. Nothing much would happen most of the time, and most of this was just to learn about your past and what your family lineage was like. The candles lit, illuminating the room. As the candles light up the room, you could hear something...

"Greetings."

This completely caught you off guard, jumping back a bit. Nothing was harmed, and you try to ignore them. You don't know this spirit, and you're sure this wasn't an ancestor of yours as they had nothing to do with the offerings currently on the altar.