הלכה על ברכות 60:14

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.