Halakhah for Yoma 106:2
אמר רבי אלכסנדרי אמר רבי יהושע בן לוי המתפלל צריך שיפסיע שלש פסיעות לאחוריו ואחר כך יתן שלום אמר ליה רב מרדכי כיון שפסע שלש פסיעות לאחוריו התם איבעיא ליה למיקם משל לתלמיד הנפטר מרבו אם חוזר לאלתר דומה לכלב ששב על קיאו
R'Mordecai said to him: Having taken the three steps backwards, he ought to remain standing, as should a disciple who takes leave of his master; for if he returns at once, it is as with a dog who goes back to his vomit. It has also been taught thus: One who prays shall take three steps backwards and then pronounce 'peace'. And if he did not do so, it would have been better for him not to have prayed at all.
Peninei Halakhah, Women's Prayer
After taking three steps backwards, one must remain standing in that place. She may not immediately return to where she prayed the Amida, for if she does, she resembles a dog that returns to its vomit (Yoma 53b), since if she returns to stand before the King without any good reason, having just taken leave from Him, she shows that she did not understand that she was standing before the King and departed His presence. Her behavior is thus considered disgraceful. Some people compound this error by returning to their initial stance and then lifting their heels slightly, as one does when reciting Kedusha. There is no reason at all to do so.
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