How do I add a debounce to this?

So a debounce is basically a variable that you set to true or false depending on when you want something to happen. So in your situation, we need to allow the function to work once, and then after it's done wait 1 second, then allow it again.

To do this, we can use any variable, but we'll just call it 'Debounce' for simplicity.

local Debounce = false --Sets the debounce variable

script.Parent.Touched:connect(function(part) 
    if part.Parent:FindFirstChild('Torso') then 
        if not Debounce then --Checks if it's currently allowed to pass
            Debounce = true --Sets to true so it wont happen again
            part.Parent.Torso.Anchored = true 
            wait(15)
            part.Parent.Torso.Anchored = false
            wait(1)
            Debounce = false --Sets it back to false so it's allowed to happen again.
        end 
    end
end)

So now your script should work. If you have any further problems/questions, please leave a comment below, and I'll see what I can do. Hope I helped :P

-Dyler3