As for why these two creatures come to mind... because Shasha has recently eaten these two types.
In fact, Shasha has been eating almost everything lately—from small fish and insects to seaweed, from krill to sea cucumbers, Shasha has swept the entire Southern Sea and basically eaten everything it should.
Besides, it also found a high-quality mineral vein on the seabed nearby, ramming into the vein daily, consuming ores, having a jolly good time.
Actually, Shasha ramming ships isn't due to a stubborn nature or it becoming a hobby, it is the instinct of the Ironclad Shark-Steel Armor Shark lineage; they need to ram the seabed to mine veins for growth and evolution, but the seabed is too hard and occasionally it feels quite dizzy from the impact, thus the texture of ships, which is neither too soft nor too hard, is almost like a scratching board to a cat for Shasha.
Seeing one makes it want to ram; it's an uncontrollable natural instinct.
