The offer was tempting and in the turtle's favor. Noah wanted to avoid battles, so he waited patiently for the turtles to finish thinking and discussing.
The turtles couldn't hide their discussions from Noah. They hissed openly, without breaking the encirclement, and their topics showed him that they were pretty reasonable.
The chance to leave the Cursed Labyrinth was appealing, but the turtles weren't ready to put their trust in a stranger. Noah was even a strange hybrid, which didn't work in his favor.
The other main topic involved what Noah had said about Heaven and Earth. The turtles naturally hated the rulers, but they didn't want to escape their imprisonment only to end up in a war. Their state was quite perfect, but they still didn't know enough about the changes in the higher plane to decide whether a fight was necessary or not.