Sentient beings were weird creatures. In many regards, they were so set in their ways that it would be virtually impossible to get them to change their minds. However, there were equally many ways you could get them to change their ways almost instantaneously.
A young master, when faced with someone far stronger than him, would politely bow his head and act subservient, while mere moments later, he would act domineering and arrogant in front of someone weaker. An elder who would do everything in his power to destroy a talented youngster from the younger generation for no other reason than annoyance would instantly change their tune upon realising that they bit off more than they could swallow. These were merely a few examples, but there were many such phenomena that occurred within the society of sentient creatures.