Halakhah for Berakhot 60:32

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.

And also from the content of the commandment is that which they warned us much about intent of the heart in prayer. And more [so] in the first blessing, about which they, may their memory be blessed, said (Berakhot 30b) that we make one who did not have intent in it go back [and repeat it]. And the matter of intent that they obligated going back because of its [absence] appears to be that the person puts into his heart that he is praying in front of God and he is calling to Him, and [that] he empty his mind from all other thoughts of the world and focus it on this. And [also] that which they said (Mishneh Torah, Laws of Prayer and the Priestly Blessing 4:5) that there are things that impede a person from praying, even though the time for prayer has arrived. And among them are purity of the hands; covering the nakedness; purity of the place of prayer; and things that rush a person, such as if one needs [to use the restroom]. And [also] that which they said (Mishneh Torah, Laws of Prayer and the Priestly Blessing 5:5) that there are things about which the one praying must be careful, but we do not impede prayer on their account. And these are them: standing; to direct [himself] that he prays facing the Temple; that he fix his body, meaning to say that he stands with awe and fear - with his eyes down and his heart towards the Heavens and he place his hands on his heart, like a slave standing in front of his master; that he fix his clothing and not stand dressed in the way of commoners; that he make his voice even, not too loud and not too soft; and that he bow during the well-known blessings and these are them - during the fathers (the first blessing) at the beginning and at the end, and during thanksgiving (the penultimate blessing), at the beginning and at the end.