Touch function bugging? Kills me when my head is no where near the killbrick

The code detects the player first if its touched it. And then it detects if the name of the hit is the head yet sometimes it kills me when the head isnt touching the killbrick .. Heres the script(its in a function)

~~~~~~~~~~~~~~~~~ function module.waterchecktouch(map) local water = map:GetChildren()

for i = 1, #water do
    if water[i]:FindFirstChild("_iswater") then
        water[i].Touched:connect(function(hit)
            if hit.Parent:FindFirstChild("Humanoid") then
                if hit.Name == "Head" then
                    hit.Parent.Humanoid.Health = 0
                end
            end
        end)
    end
end

end~~~~~~~~~~~~~~~~~