Well, I am going out on a limb here, I understand

but i think a lot of people underestimate the forces at work in reptiles. Most sources explain that reptiles are purely instinctual animals. I am sure instinct plays an enormous part in their behavior. But to say that all reptiles are genetically preset in their every responses to stimuli has to be wrong.
Morrison is clearly doing something. He has done it multiple times. I doubt it's a symptom of something as he is healthy all around.
The real issue i think is if it is physiologically possible based on the anatomy of a gecko.