How to make animation stop when one key stops being pressed?

So basically in this script you have to press 2 keys to run a certain animation "W and A". However pressing W runs another animation(in another script) so whenever a player stops holding down A the animation for pressing "W and A" still plays instead of going back to the animation when W is being held down.

Script:

local p = game.Players.LocalPlayer
local anim = script.Animation
local serv = game:GetService("UserInputService")
local keyCodeW = Enum.KeyCode.W
local keyCodeA = Enum.KeyCode.A
local char = p.Character 
if not p.Character then 
    repeat wait() until p.Character 
end
local human = char:WaitForChild("Humanoid") 
wait(1)
local newAnim = human:LoadAnimation(anim)
serv.InputBegan:Connect(function(key,processed)
     if serv:IsKeyDown(keyCodeW) and serv:IsKeyDown(keyCodeA) then 
        print("Starting animation!")
        newAnim:Play()
    end
end)


serv.InputEnded:Connect(function(key,processed)
    if not serv:IsKeyDown(keyCodeW) then
        newAnim:Stop()
    end
end)