-- Attack / chase behaviour
local function attack(player)
    if not player or targetedPlayer then return end
    if not player.Character or not player.Character.PrimaryPart then return end

    targetedPlayer = player
    -- Plays a scary sound from a Folder SCP173 called "Vuewing", that is the sound that plays the second you look at 096s face
    scarePlayer:FireClient(targetedPlayer, "scp173", "Viewing", NPC.Head)
    triggerAnim:Play()
    if hrp:FindFirstChild("Look") then hrp.Look:Play() end
    task.wait(0.2)
    if hrp:FindFirstChild("Trigger") then hrp.Trigger:Play() end

    task.wait(triggerTime)

    -- prepare path and follow
    local currentWaypoints = {}
    local currentIndex = 1
    local lastPlayerPos = player.Character.PrimaryPart.Position

    local function refreshPath()
        local success, err = tryComputePath(NPC.PrimaryPart.Position, player.Character and player.Character.PrimaryPart and player.Character.PrimaryPart.Position)
        if not success then
            table.clear(currentWaypoints)
            return
        end
        currentWaypoints = path:GetWaypoints()
        currentIndex = 1
    end

    refreshPath()

    -- start chase animations/sounds
    runAnim:Play()
    if hrp:FindFirstChild("Scream") then hrp.Scream:Play() end
    if scp096Remote then scp096Remote:FireClient(player) end

    -- monitor player movement and refresh path if necessary
    local refreshTask = task.spawn(function()
        while targetedPlayer do
            if not player.Character or not player.Character.PrimaryPart then
                break
            end
            local curPos = player.Character.PrimaryPart.Position
            if (curPos - lastPlayerPos).Magnitude >= 2 then
                lastPlayerPos = curPos
                refreshPath()
            end
            task.wait(0.25)
        end
    end)

    -- follow current waypoints
    while targetedPlayer and currentIndex <= #currentWaypoints do
        if not player.Character or not player.Character.PrimaryPart or player.Character.Humanoid.Health <= 0 then
            break
        end

        humanoid.WalkSpeed = 35
        local wp = currentWaypoints[currentIndex]
        if wp and wp.Position then
            humanoid:MoveTo(wp.Position)
            humanoid.MoveToFinished:Wait()
        end
        currentIndex = currentIndex + 1
    end

    -- Kill player once the NPC has reached final waypoint
    -- We do not need any check if the NPC is on its final waypoint since the while loop will only end if all waypoint were used

    if targetedPlayer and player.Character and player.Character.PrimaryPart and player.Character.Humanoid.Health > 0 then
        if hrp:FindFirstChild("Kill") then hrp.Kill:Play() end

        local particle = script:FindFirstChild("Particle")
        if particle and player.Character.PrimaryPart:FindFirstChild("RootAttachment") then
            local pClone = particle:Clone()
            pClone.Parent = player.Character.PrimaryPart.RootAttachment
            pClone:Emit(5)
            Debris:AddItem(pClone, 2)
        end

        if player.Character:FindFirstChild("Humanoid") then
            player.Character.Humanoid:TakeDamage(math.huge)
        end
    end

    targetedPlayer = nil
    runAnim:Stop()
    if hrp:FindFirstChild("Scream") then hrp.Scream:Stop() end
    humanoid.WalkSpeed = 8
end