Coiling snake? Coiling how?
Kundalini is commonly seen as a snake.
There is still a very very common symbol of a snake climbing a pole that you will see in every hospital in America. It is an ancient symbol of health, medicine, and healing.
In Egypt the cobra especially is very significant, but if it isn't a cobra then it probably has nothing to do with it.
Snakes being "bad" or "evil" is a Christian concept that has permeated and tainted our society's way of thinking. Unless you yourself had a foreboding feeling when seeing this snake, I would not concern yourself with the stereotype created to drag pagan gods through the mud.
And the simplest answer could be that it is your associated animal aka "fetch" aka "spirit animal" therefore it is apart of you, likely the part that you tap into when scrying.