code: public static void destroyConcurrentScope(PvmExecutionImpl execution) {
      ensureConcurrentScope(execution);
      LOG.destroyConcurrentScopeExecution(execution);
      execution.destroy();
    }
docs: Destroys a concurrent scope Execution. This can only happen if
  (a) the process instance has been migrated from a previous version to a 7.3+ version of the process engine
  
  See: javadoc of this class for note about concurrent scopes.
  
  @param execution the execution to destroy