You have guessed right.

HERBERT The trees renew their murmur:
Come, let us house together.

[OSWALD conducts him to the dungeon.]

OSWALD (returns)
Had I not
Esteemed you worthy to conduct the affair
To its most fit conclusion, do you think
I would so long have struggled with my Nature,
And smothered all that's man in me?--away!--
[Looking towards the dungeon.]
This man's the property of him who best
Can feel his crimes. I have resigned a privilege;
It now becomes my duty to resume it.

MARMADUKE Touch not a finger--

OSWALD What then must be done?

MARMADUKE Which way soe'er I turn, I am perplexed.

OSWALD Now, on my life, I grieve for you. The misery
Of doubt is insupportable. Pity, the facts
Did not admit of stronger evidence;
Twelve honest men, plain men, would set us right;
Their verdict would abolish these weak scruples.

MARMADUKE Weak! I am weak--there does my torment lie,
Feeding itself.

OSWALD Verily, when he said
How his old heart would leap to hear her steps,
You thought his voice the echo of Idonea's.

MARMADUKE And never heard a sound so terrible.

OSWALD Perchance you think so now?

MARMADUKE I cannot do it:
Twice did I spring to grasp his withered throat,
When such a sudden weakness fell upon me,
I could have dropped asleep upon his breast.

OSWALD Justice--is there not thunder in the word?
Shall it be law to stab the petty robber
Who aims but at our purse; and shall this Parricide--
Worse is he far, far worse (if foul dishonour
Be worse than death) to that confiding Creature
Whom he to more than filial love and duty
Hath falsely trained--shall he fulfil his purpose?
But you are fallen.

MARMADUKE Fallen should I be indeed--
Murder--perhaps asleep, blind, old, alone,
Betrayed, in darkness! Here to strike the blow--
Away! away!--

[F