public void describeBehaviour(Description d) {
    final int DT = yard.drillType() ;
    if ((! describedByStep(d)) && DT >= 0) {
      d.append("Training "+DrillYard.DRILL_STATE_NAMES[DT]) ;
    }
    d.append(" at ") ;
    Target t = lastStepTarget() ;
    if (t == null || Visit.arrayIncludes(yard.dummies, t)) t = yard ;
    d.append(t) ;
  }