C2560 Have You Ever Heard of Catching a Turtle in a Jar

"Shh!" Tang Yu gestured for them to keep quiet. He used his ears to stick to the ground, trying to hear what was happening outside more clearly. Then, he repeated, "There are at least six people approaching us. There are guns."

He had just laid on the ground, so it was easier for him to hear what was happening outside -

It was the sound of people deliberately slowing down their footsteps