In the art of war, the best defence is offence. To deflect the enemy's weapon against the enemy is a surprising strategy and also to make the best use of energy for a long battle if necessary. Ling knows that. Mao knew too well.
Ling Liong Sik has countersued Najib. The latter is now put on the defensive. He has to swallow his own bitter pill.
p.s. Sanusi said that the 'enemy' is nafsu kuat and hence ready for a long drawn battle.