Sam was really intrigued by these creatures. They have a clear advantage over sirens. The water elemental energy is not affecting them that much. The attacks might cause them trouble but the problem is the element of surprise. The normal spiritual sense couldn't even scan its presence and the energy waves.
They are merged with the rocks completely. If Sam didn't use the energy vision and the urchins are not using the energy and a weird method to conceal themselves, then it would have been different. They are not completely concealing their energy, they are more like manipulating it to be 'invisible'.
But energy vision worked its wonders.
Sam was really impressed by these things, they are extremely different and dangerous and that is not because of their massive size, or their intimidating aura with a lot of killing intent which is extremely common in most beasts.
Rather they are just dangerous for what they are.
"Let me take a closer look."
