After arriving at the edge of the forest where he could see the humanoid demons' base and the hundreds of demihumans living inside it, unlike Vera, who was unaffected by the wooden walls and the black rock tower, Blake did feel some type of pressure from the tall towers that looked ominous with the materials they were built with.
Of course, Blake didn't know that the materials that were used to create the towers weren't something that could be acquired from the areas around him and he also didn't think about how the humanoid demons managed the transportation and logistics of moving those black rocks.
What made him conscious of the towers were their literal towering heights and the ominous look that the black and jagged rocks that made the body of the whole tower gave.