public static boolean canCarry(Actor carries, Actor actor) {
    if (carries == null || actor == null) return false ;
    for (Mobile m : actor.aboard().inside()) {
      if (m instanceof Suspensor) {
        final Suspensor s = (Suspensor) m ;
        if (s.passenger == actor) {
          if (s.followed == carries) return true ;
          return false ;
        }
      }
    }
    return true ;
  }