Pathfind only update once it's route is first complete?

So I have this zombie that is supposed to path find to the closest player. It works perfectly without one thing, the zombie will only update the path when he reaches his target position. https://gyazo.com/bdd1ce536fbe8d157c816b32d1a5b212

--Zombie
local torso = script.Parent.Torso
local targ = nil
local db = false
local pathService = game:GetService("PathfindingService")
local zombieDamage = 50
local zombieWait = 1



function getClose()
	local ptorso = game.Players:GetChildren()
	local ptab = {}
	for i = 1, #ptorso do
		table.insert(ptab, i, (torso.Position-ptorso[i].Character.Torso.Position).magnitude)
		
	end
	table.sort(ptab)
	for i = 1, #ptorso do
		if (torso.Position-ptorso[i].Character.Torso.Position).magnitude == ptab[1] then
			targ = ptorso[i]			
		end
	end
end

function pathfind()
  local path = pathService:ComputeRawPathAsync(torso.Position, targ.Character.Torso.Position, 512)
  local points = path:GetPointCoordinates()
  
	for _,v in pairs(points) do
	local part = Instance.new("Part")
	part.Size = Vector3.new(1,1,1)
	part.Anchored = true
	part.CanCollide = false
	part.Position = v 
	part.Parent = workspace
	game:GetService("Debris"):AddItem(part,0.1) 
	
	wait()
end

  for _,point in pairs (points) do
	torso.Parent.Humanoid:MoveTo(point)
	while (torso.Position - point).magnitude > 4 do
		wait(0.1)
	end
  end
end


torso.Parent.Humanoid.Died:connect(function()
	wait(0.5)
	torso.Parent:Destroy()
end)



function attack()
	if db == false then
    	db = true
    	local human = targ.Character:FindFirstChild("Humanoid")
    	if human ~= nil and human.Health > 0 then
      	human:TakeDamage(zombieDamage)
      	wait(zombieWait)
      	db = false
      end
    end
end


while wait() do
	getClose()
	pathfind()  --here the problem is located I think? Do I have to use coroutines and if so, how?
	if (torso.Position-targ.Character.Torso.Position).magnitude < 3 then
		attack()
	end
end