Normal bullets would face too much resistance when fired underwater. The shot would become weaker the farther it had to travel, and the sea conch would likely notice its approach.
But Han Sen had his Original Water King Body and sea dragon area. He combined with the sea of Planet Water Zone itself. He used his water powers to create Spell's ammunition, so the bullet also had water abilities. Rather than being slowed down by the water it passed through, the bullet was actually buffed by the sea. It flew toward the sea conch silently, like a phantom.
But Han Sen wasn't firing at the exposed flesh of the creature. He was firing at the conch's shell.
Pang!
The bullet hit the sea conch's shell, punching a small hole straight through. The sea conch shook and immediately activated its blue light. The light quickly covered the sea conch's shell, protecting the small hole.