These people were running towards Bartlett frantically while constantly waving and shouting at him, signaling him to hurry up and climb the ladder to leave.
As the group approached, Bartlett felt the ground beneath his feet begin to tremble. The trembling became more and more intense, accompanied by rumbling sounds, as if something was about to rush out of the tunnel.
Holy moly, it's a big one!
As the situation was unclear, Bartlett decided to err on the side of safety. He put away his Twin Blades, prepared to follow the instructions of those people, and turned to climb the ladder, since they knew more about the situation than he did.
The Barbarian left the Luminous Stone with those people to help them illuminate the area, and then turned and ran towards the wooden ladder, reaching it in a few instants. When he looked back at the group, he saw a huge Purple Insect burst out violently from around the corner of the tunnel.