What does it mean to add wings to a tiger and lose like a wave of sand?

"Anger like a tiger, defeat like sand waves" is a common saying in China, which means that when a person loses his temper, he is as strong as a tiger, but when he fails, he collapses like sand waves instantly. This sentence is a metaphor for people's perseverance, but it also reminds people that they may need to be more cautious when facing setbacks.