אורח חיים ק״דOrach Chayim 104

Se’if 1א׳

לֹא יַפְסִיק בִּתְפִלָּתוֹ. וַאֲפִלּוּ מֶלֶךְ יִשְׂרָאֵל שׁוֹאֵל בִּשְׁלוֹמוֹ, לֹא יְשִׁיבֶנּוּ; אֲבָל מֶלֶךְ א"ה, אִם אֶפְשָׁר לוֹ לְקַצֵּר דְּהַיְנוּ שֶׁיֹּאמַר תְּחִלַּת הַבְּרָכָה וְסוֹפָהּ קֹדֶם שֶׁיַּגִּיעַ אֵלָיו, יְקַצֵּר; אוֹ אִם אֶפְשָׁר לוֹ שֶׁיִּטֶּה מִן הַדֶּרֶךְ, יִטֶּה וְלֹא יַפְסִיק בְּדִבּוּר, וְאִם אִי אֶפְשָׁר לוֹ, יַפְסִיק.

To Not Interrupt In The [Middle Of The Amidah] Prayer. Containing 8 S'ifim: One may not interrupt during one's prayer [i.e. Amidah]. And even if a Jewish king is inquiring about one's well-being, one may not respond to him. But [regarding responding to] a king of the nations of the world, if one is able to shorten [one's prayer], meaning that one would say the beginning of the blessing and its end before the [king] reaches one, one should shorten it. Or if [one's on the road and] one is able to veer off the road, [then] one should veer off, but one may not interrupt by talking. And if it's impossible for one [to do so], one may interrupt.

Se’if 2ב׳

הָיָה מִתְפַּלֵּל בַּדֶּרֶךְ וּבָאָה בְּהֵמָה אוֹ קָרוֹן כְּנֶגְדּוֹ, יִטֶּה מִן הַדֶּרֶךְ וְלֹא יַפְסִיק; אֲבָל בְּעִנְיָן אַחֵר, אֵין לָצֵאת מִמְּקוֹמוֹ עַד שֶׁיִּגְמֹר תְּפִלָּתוֹ, אֶלָּא אִם כֵּן הוּא בַּתַּחֲנוּנִים שֶׁלְּאַחַר הַתְּפִלָּה.

If one was praying on the road and an animal or a wagon approaches before one, one should veer from the road and not interrupt [by talking]. But for another matter, one should not go out from one's place until one finishes one's prayer, unless one is up to the supplications that are after the [Amidah] prayer.

Se’if 3ג׳

וַאֲפִלּוּ נָחָשׁ כָּרוּךְ עַל עֲקֵבוֹ, לֹא יַפְסִיק, אֲבָל יָכוֹל לֵילֵךְ לְמָקוֹם אַחֵר כְּדֵי שֶׁיִּפֹּל הַנָּחָשׁ מֵרַגְלוֹ (הר"י רֵישׁ פֶּרֶק אֵין עוֹמְדִין); אֲבָל עַקְרָב, פּוֹסֵק, לְפִי שֶׁהוּא מוּעָד יוֹתֵר לְהַזִּיק, וְנָחָשׁ נָמֵי, אִם רָאָה שֶׁהוּא כָּעוּס וּמוּכָן לְהַזִּיק, פּוֹסֵק.

And even [if] a snake is coiled around one's heel, one should not interrupt, (but one may move to a different place so that the snake falls off one's leg) (the Ri at the beginning of Chapter "Ain Omdin" [Berachot 30b:14]). But [regarding] a scorpion - one interrupts, because it is more prone to do harm; and so too a snake, if one sees that it is angry and ready to do harm, one interrupts.