You cast a small fireball directly at the Sewer Snake,
which burns through its body cutting it into two
halves.
Both halves now attack you and are crushing your chest.
Trying a different strategy,
you create flames which burn in each hand and rub them over the Snake's coils.
The creature twitches violently and releases its grip!
You find its head and smother it in your flaming hands,
burning it to death.