One of Signless's ears flicks. He isn't quite sure, but that didn't sound like normal night noises, or just the creaking of an infirm hive. He looks at Karkat and jerks his head in that direction, as though to ask 'did you hear that?' as he stands, very quietly, very carefully.

He's going to go investigate and he'll want someone with him who'll actually use their knife if it comes down to that.