He went off in a frenzy out of anger.

The river water is flowing in the reverse direction.

The river water is flowing in the opposite direction.

This problem has a paradoxical answer.

He was prepared for the enemy's counterattack.

He began to strike back against the enemy.

He was plotting a rebellion against the king.

He outsmarted his competitors by using a contrarian business strategy.

He succeeded in business by going against the grain.

Of course, he can solve that problem.