Tosafot on Berakhot Daf 33a
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אבל עקרב פוסק - בירושלמי קאמר דאם היה נחש מרתיע לבא כנגדו פוסק לפי שבא כנגדו בכעס מתכוין להזיקו ומיהו לא מצינו אם פסק שיחזור לראש מדלא קאמר ואם פסק חוזר לראש אבל לתחלת ברכה מיהא יחזור ואם טעה בג' ראשונות או בג' אחרונות חוזר לתחלת הג' באבות בראשונות ובעבודה באחרונות כדאמרינן לקמן בפרקין (ברכות דף לד.):
BUT IF A SCORPION [APPROACHES WHILE HE IS PRAYING], HE STOPS. It is not only when a scorpion attacks that one is allowed to interrupt his prayers. Sometimes, even when a snake attacks one may interrupt his prayers if there is danger. Yerushalmee says that if a snake was coming at him angrily he may interrupt his prayers, because it is coming at him with anger and intending to harm him. When one is allowed to interrupt his prayers, where does he start when the danger is passed? However, we do not find that if he interruptedhis prayer that he must start at the beginning, since the Yerushalmee does not specifically say that he must return to the beginning. But he should however return to the beginning of the b’rochohthat he interrupted. And if one erred during the first three b’rochos or the last three b’rochos, he returns to the beginning of thefirst threeb’rochos **which is Avos,**the b’rochoh dealing with our forefathers, **when the error is in the first b’rochos.**And he returns **to avodoh,**the b’rochoh that begins with R’tzay, when the error is in the last b’rochos, as we say later in our perek (34a).