allback = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(fixture_a, fixture_b)</span></span>
  <span class="hljs-keyword">local</span> entity_a_type = fixture_a:getUserData()
  <span class="hljs-keyword">local</span> entity_b_type = fixture_b:getUserData()
  <span class="hljs-comment">-- Check these aren&apos;t the same type of entity</span>
  <span class="hljs-keyword">if</span> entity_a_type ~= entity_b_type <span class="hljs-keyword">then</span>
    <span