Sam's expression remained solemn as they travelled back to their base.
They didn't even use the spatial tokens to back to the cave. It is not like Sam raised any objections, he just didn't speak to them at all. He slowly flew over on the harbinger, while Chetan and team felt extremely terrified and guilty over what he did.
So, they just shut their traps and followed him back.
What they didn't know is, Sam is checking the environment around.
The planet has a way to sustaining and keeping itself in balance. And the city they destroyed along with the spiritual energy veins below it are all part of that system that keeps the planet in balance. Because of the abrupt loss of that city, he wondered if there are going to be any changes in the nearby surroundings.
However, all he noticed is that the energy concentration in the immediate surroundings has drastically reduced.