Miarwi- as you may know these animals are as diverse and imperfect as is humans- thier thyroid activity that causes them to shed is complex and different snakes (of even the same species) have different results under the same conditions. The behavior you are talking about seems typical of any colubrid or boid as they feel discomfort during an imperfect shed cycle. Soaking boids at a monitored 80-85 degrees will help relieve this by making the skin to slough more pliable and easier removed by them or their keeper.