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javascript - Add a listener to a child inside of a firebase generated key?

Given the layout

+ activity
  + -K5p_pBXog4kb0SVLXxj
    text:'something',
    when:111
    + thread
      + -K5paF53zm3cuudP9FUQ 
        id:8,
        text:'something else'

Is there a way to add a listener to any new "thread" inserts inside of activity like /activity/*/thread?

When new activities get added I am getting the feed on those but when a thread is appended nothing triggers. Do I need to move the [thread] section out to it's own root and match thread ID's with activity ID's to know when a thread comment is made against the main activity thread?

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