Why isn't PathfindingService making a path?

For some reason, the PathfindingService path isn't making anything in the table for the NPC to move to. Please help!

while true do
    local pathfindingService = game:GetService("PathfindingService")
    local origin = mytorso.Position
    local old = hum.Health
    local mode = findrandomRally()

    hum.HealthChanged:Connect(function()
        if hum.Health < old then
            mode = findnearestHumanoid()
        end
    end)

    if mode ~= nil then
        local torso = mode:FindFirstChild("Torso") or mode:FindFirstChild("HumanoidRootPart")
        local path = pathfindingService:FindPathAsync(mytorso.Position, torso.Position)

        -- calculate new
        local points = path:GetPointCoordinates()

        for _, point in pairs(points) do
            script.Parent.Humanoid:MoveTo(point)

            script.Parent.Humanoid.MoveToFinished:Wait()
        end

    end

    wait(2)
end