When the disciples saw Jesus calm the stormy sea they were once again astonished and amazed and blown away. Even though they had seen Jesus calm a stormy sea previously, and seen Him heal people and cast out demons and feed over 5,000 with just two loaves and five fish, they were astonished as if they didn't have a clue as to who Jesus was. And that was exactly it. They couldn't connect the dots that Jesus was God robed in flesh. Mark tells us that their heart was hardened and they didn't understand the lesson of the loaves.