When you trigger it, Snake will die, causing a game over screen. This is intended though. Just take the Revival Pill afterwards and a scene will play, which will end the fight.

We recommend catching the Snake Mackerel first as this will likely be your first time in Devil's Spine if you do this Pursuit early, and will be the longest part of your journey.

Treat all snakebites as though they were venomous. Get to a hospital emergency room as soon as you can.