docs: def call_later(_seconds, _f, *args, **kwargs):
      '''
      Wrapper for reactor.callLater() aware the time scalling.
      This method should always be used instead directly touching the reactor.
      See: L{twisted.internet.interfaces.IDelayedCall.callLater}.
      '''
      cur_scale = _get_scale()
      if cur_scale == 1:
          return reactor.callLater(_seconds, _f, #@UndefinedVariable
                                   *args, **kwargs)
      else:
          _seconds = _seconds * cur_scale
          call = reactor.callLater(_seconds, _f, #@UndefinedVariable
                                   *args, **kwargs)
          return ScaledDelayedCall(cur_scale, call)