ח תפשוט ליה מדתנן כיסהו ונתגלה פטור מלכסות כיסהו הרוח חייב לכסות ואמר רבה בר בר חנה א"ר יוחנן לא שנו אלא שחזר ונתגלה אבל לא חזר ונתגלה פטור מלכסות
8 You can solve this problem from what we have learned: If one covered it [blood of a wild animal or bird that had been slaughtered], and it became uncovered, he is exempt from having to cover it again; but if the wind covered it, he is obligated to cover it himself. And Rabbah b. Bar Hanah said in the name of R. Yohanan: This was taught only when the wind again uncovered it, but if the wind did not again uncover it, he is exempt from having to cover it.