The running event of Humanoid isn't connecting to my function?

I am making a pathfinding zombie but I need it to update the path when the player it's following moves. However, the event connecting to the function never fires, doesn't give an output, and won't break if I put a breakpoint at that line.

This first part of the code runs fine:

    players = game.Players:GetPlayers()
    randomPlayer = players[math.random(1, #players)]
    print(randomPlayer.name)
    pathService = game:GetService("PathfindingService")

The broken-looking code is here, and it'd be helpful to know what went wrong:

game.Workspace:WaitForChild(randomPlayer).Character.Humanoid.Running:connect(function(speed)
        print("Moved")
        game.Workspace.Points:ClearAllChildren()
        wait(0.1)
        rawPath = pathService:ComputeRawPathAsync(script.Parent.Torso.Position, randomPlayer.Character.HumanoidRootPart.Position, 512)
        path = rawPath:GetPointCoordinates()
end)

I will also post the entire script (which isn't much) in case the problem doesn't lie in the above snippet:

wait(0.1)
while true do
    players = game.Players:GetPlayers()
    randomPlayer = players[math.random(1, #players)]
    print(randomPlayer.name)
    pathService = game:GetService("PathfindingService")

    wait(0.1)

    rawPath = pathService:ComputeRawPathAsync(script.Parent.Torso.Position, randomPlayer.Character.HumanoidRootPart.Position, 512)
    path = rawPath:GetPointCoordinates()


    game.Workspace.Points:ClearAllChildren()

    partReached = true

    for x = 1, #path do

        if partReached == true then
            partReached = false
            p = Instance.new("Part", game.Workspace.Points)
            p.CanCollide = false
            p.FormFactor = Enum.FormFactor.Symmetric
            p.Size = Vector3.new(1,1,1)
            repeat wait() until path[x] ~= nil
            p.Position = path[x]
            p.Anchored = true
            p.BrickColor = BrickColor.DarkGray()
            p.Transparency = 0
            script.Parent.MazeHumanoid:MoveTo(p.Position, p)
        end

        while partReached == false do
            wait(0.1)
            p.Touched:connect(function(part)
                if part.Parent.MazeHumanoid ~= nil or part.Parent.Parent.MazeHumanoid ~= nil then
                    partReached = true
                end
            end)
        end

    end
end

game.Workspace:WaitForChild(randomPlayer).Character.Humanoid.Running:connect(function(speed)
        print("Moved")
        game.Workspace.Points:ClearAllChildren()
        wait(0.1)
        rawPath = pathService:ComputeRawPathAsync(script.Parent.Torso.Position, randomPlayer.Character.HumanoidRootPart.Position, 512)
        path = rawPath:GetPointCoordinates()
end)