The three minke whales and the newly appeared giant whale were all set for a showdown––especially the male minke whale, who was trying to protect the other two minke whales. It was provoking the giant whale to try to chase it away; however, the differences in their physique was too large, so it was a futile effort. In fact, it was an effort that could even bring about its own death.
The only advantage the minke whale had was that it was agile, but they were so close to the shore and the water was so shallow that its agility was quite restricted. The huge size of the giant whale practically blocked any escape routes.
Under normal circumstances, a giant whale with that kind of physique was unlikely to risk coming into such shallow waters. If it was not able to have a proper grasp of when the tide rose and when it ebbed, then there was the possibility that it could be stranded at any time.