What does it mean when tigers from plain plains return to mountains and forests, and they are restless when the autumn wind blows and leaves fall?

The tigers in Pingchuan have returned to the mountains and forests, and the sound of autumn wind blowing fallen leaves makes people feel uneasy. "The tigers from Pingchuan return to the mountains and forests, and they are restless when the autumn winds fall leaves." From "Gengyin", the original text is "The tigers from Pingchuan return to the mountains and forests, and are restless when the autumn winds fall leaves. I like it best when the mountains are covered with heavy snow, and the thick shade of three summers lies in the sky." "Geng Yin" "Yin" is one of the sixty-year-old usage poems.