Rails 4 getting local variable to js.erb file

I've read/researched other answers, but I can't get this to work. I have a js.erb file that is rendering a partial. I'm looking to pass a @node variable to it but I get an error in the console NameError: - undefined local variable or method "node" for #<#<Class:0x007fdcd9163510>:0x007fdcd813b728>

I'm not sure why it won't grab it.

_node.html.erb (node is a local variable in this partial):

<div id="tagged_users">
  <%= render partial: "nodes/user_tag_list", locals: { node: node } %>
</div>

partial that I would also like rendered in js.erb

_user_tag_list.html.erb:

<ul>
  <% node.tagged_users.map(&:name).each do |tag| %>
    <li><%= tag %>
      <%= link_to "x", node_path(node, remove_tag: tag), method: :patch %>
    </li>
  <% end %>
</ul>

node#update controller action:

def update
  @node = Node.find(params[:id])

  if params.fetch(:node, {}).fetch(:autocomplete_tag_names, false)
    tag = params[:node][:taggable_email]
    @node.user_tag_list.add(tag)
    @node.save

      respond_to do |format|
        format.js { render 'user_tag_add.js.erb' }
      end
    elseif
      # ...
    else
    # ...
  end

and finally, the js.erb file:

user_tag_add.js.erb:

$("#tagged_users").html("<%= escape_javascript(render 'user_tag_list', locals: { node: @node }) %>");

A couple of notes. The logic is sound. If I replace the html with a string rather than the partial it works fine. Also, if I binding.pry I can set node to @node without issue. Just can't get the @node to pass to node within the js.erb file.

EDIT

Here's the form partial, if useful:

<%= form_for node, remote: true, html: { class: "edit_node tag-users" } do |f| %>
  <%= f.label :autocomplete_tag_names %>
  <%= f.text_field :autocomplete_tag_names, data: { autocomplete_source: users_path }, value: nil %>
  <%= f.hidden_field :taggable_email, value: nil %>
  <%= f.submit %>  
<% end %>