What is the significance of the movement of the leg of Al-Walid ibn Abd al-Malik after his burial, in relation to torment?

This report was mentioned by the author of "Al-Kamil fi al-Tarikh," stating that when Al-Walid ibn Abd al-Malik was lowered into his grave, his knees were drawn up to his neck. His son asked, "Is my father alive?" Umar ibn Abd al-Aziz, who was among those burying him, replied, "By Allah, your father was hastened!" And Umar took a lesson from this. It may be understood from this movement that the angels of torment hastened him. Another narration states that Al-Walid struggled in his shroud when he was placed in the grave. It is possible that this action was due to the intense terror that befell him.