This cat must have been bathed at least once in his lifetime so he knows what a terrible experience getting wet is. When he came into the bathroom and saw his human submerged under the water and not even kicking and screaming he rushed to save her. Who would voluntarily get wet and even laugh at his heroic rescue attempts? She obviously lost her mind.
Ridiculed or not, the hero had to do what it takes in order to get his poor human out to dry land