I actually ended up with this word while attempting to translate the French word "hydrocution" but after some more googling it looks like "cold shock response"

I actually ended up with this word while attempting to translate the French word "hydrocution" but after some more googling it looks like "cold shock response" is the right term: https://en.wikipedia.org/wiki/Cold_shock_response https://en.wikipedia.org/wiki/Cold_shock_response