Player Dying Breaks Script, Variables do not match up with new character?

The following script is just me testing projectiles with Bezier curves. It spawns at your character's HumanoidRootPart location and travels to your mouse's position. Everything works, but when I reset or when my character dies, the localscript is using the location of the HumanoidRootPart of my "dead body". Every time I reset, the HRP references the previous body's HRP.

I could probably just put the variable inside the inputbegan function, but I just wanted to know what was happening, why, and any more possible solutions.

local player = game:GetService('Players').LocalPlayer;
local character = player.Character or player.CharacterAdded:wait();
local hrp =  character:FindFirstChild('HumanoidRootPart') or 
	character:WaitForChild('HumanoidRootPart');
local mouse = player:GetMouse();

local uis = game:GetService('UserInputService');
local runs = game:GetService('RunService');

local waterball = script:FindFirstChild('Waterball') or script:WaitForChild('Waterball');

local function quadraticBezier(t, p0, p1, p2)

	return (1 - t)^2 * p0 + 2 * (1 - t) * t * p1 + t^2 * p2

end

local debounce = false;
local size = 32;

uis.InputBegan:Connect(function(key, proc)
	if proc then return end;
	if debounce then return end;
	
	if key.KeyCode == Enum.KeyCode.R then
		debounce = true;
		local pos = mouse.Hit;
		local curcf = CFrame.new(hrp.Position, pos.Position);
		
		local waterballA = waterball:clone();
		waterballA:PivotTo(curcf);
		waterballA.Parent = workspace;
		local waterballB = waterball:clone();
		waterballB:PivotTo(curcf);
		waterballB.Parent = workspace;
		local waterballC = waterball:clone();
		waterballC:PivotTo(curcf);
		waterballC.Parent = workspace;
		
		local delta = 0;
		local midA = curcf:Lerp(pos, .5) * CFrame.new(0, size, 0);
		local midB = curcf:Lerp(pos, .5) * CFrame.new(size, 0, 0);
		local midC = curcf:Lerp(pos, .5) * CFrame.new(-size, 0, 0);
		local conc;
		conc = runs.Heartbeat:Connect(function()
			delta = delta + runs.Heartbeat:wait();
			if delta > 1 then delta = 1 end
			
			waterballA:PivotTo(CFrame.new(quadraticBezier(delta, curcf.Position, midA.Position, pos.Position), pos.Position));
			waterballB:PivotTo(CFrame.new(quadraticBezier(delta, curcf.Position, midB.Position, pos.Position), pos.Position));
			waterballC:PivotTo(CFrame.new(quadraticBezier(delta, curcf.Position, midC.Position, pos.Position), pos.Position));
			
			
			if delta == 1 then 
				local expl = Instance.new('Explosion');
				expl.Position = pos.Position;
				expl.Parent = workspace;
				
				waterballA:Destroy();
				waterballB:Destroy();
				waterballC:Destroy();
				conc:disconnect() 
			end
		end)
		
		
		task.wait(1);
		debounce = false;
	end
end)

Its because you don't update the character variable when the character respawns. I'm pretty sure thats what characteradded:wait() supposedly does, as I was told by multiple people in the past, but doesn't seem to work for me whenever I try. Can't really give you an explanation on that as I don't know too much myself, but a possible solution would be to check when the character respawns and update it.

player.CharacterAdded:Connect(function(newCharacter)
	character = newCharacter
end)