How can I make this IntValue decrease when it's parent is hit by a sword?

This is my current script:

local core = script.Parent
local health = script.Parent.health.Value

core.Touched:connect(function(s)
	local p = game.Players:getPlayerFromCharacter(s.Parent.Parent)
if (s.Name == "Handle") and (p.TeamColor == BrickColor.new("Bright red")) then
	health = health - 20
end
end)

health is the IntValue that's a child of core, it's set at 5000.

Handle is the name of the brick of the sword that I'm using.

I would like it to only decrease health when the player with the sword is on the Bright red team.

Whenever I am testing it, the health value simply stays at 5000 and doesn't decrease, I don't get any errors related to the script in output...

You need to find the Humanoid touched by the sword, then make a delay or everytime the sword is collided with the humanoid and it moves it will takes damage:

local core = script.Parent
local health = core:FindFirstChild("health") -- Check for the IntValue, don't get without checking, never!
 
core.Touched:connect(function(s)
	local h = s.Parent:FindFirstChild("Humanoid")
	--Don't define an instance for a color
	if (p.TeamColor == "Bright red") then -- It calls the function automatically in your "core" variable
		health.Value = health.Value - 20
	end
end)