Why does this script work for animations and walk speed?

Alright, so first of all

local UIS = game:GetService('UserInputService') local Player = game.Players.LocalPlayer local Character = Player.Character

UIS.InputBegan:connect(function(input)--When a player has pressed LeftShift it will play the animation and it will set the normal walking speed (16) to 35. 
    if input.KeyCode == Enum.KeyCode.LeftShift then 
        Character.Humanoid.WalkSpeed = 25 
        local Anim = Instance.new('Animation')  
        Anim.AnimationId = 'rbxassetid://10867310905'   
        PlayAnim = Character.Humanoid:LoadAnimation(Anim) 
        PlayAnim:Play() 
    end 
end)

UIS.InputEnded:connect(function(input)
    if input.KeyCode == Enum.KeyCode.LeftShift then 
        Character.Humanoid.WalkSpeed = 16 
        PlayAnim:Stop() 
    end 
end)

I will break it into 2 parts. Explaining inputBegan and inputEnded

Inputbegan registers when they press any key. This script checks if the key they pressed was the Left shift. If it was, then it increases their walkspeed. Then it creates a new animation, sets the ID (the animation it will play) and loads the animation. after loading, it plays.

InputEnded registers when any type of input ends. So the script checks what input ended, which is the leftShift. Then it sets their walkspeed back to normal, and the animation is stopped.

If this answer helped you, then please accept it and upvote it. If you want to talk more about scripting, message me on iNi#2338