Eh? What? Why laugh'st thou not thereat?

SHUISKY. I, Sire?

TSAR. Hark, Prince Vassily; when first I learned this child
Had been--this child had somehow lost its life,
'Twas thou I sent to search the matter out.
Now by the Cross and God I do adjure thee,
Declare to me the truth upon thy conscience;
Didst recognise the slaughtered boy; was't not
A substitute? Reply.

SHUISKY. I swear to thee--

TSAR. Nay, Shuisky, swear not, but reply; was it
Indeed Dimitry?

SHUISKY. He.

TSAR. Consider, prince.
I promise clemency; I will not punish
With vain disgrace a lie that's past. But if
Thou now beguile me, then by my son's head
I swear--an evil fate shall overtake thee,
Requital such that Tsar Ivan Vasilievich
Shall shudder in his grave with horror of it.

SHUISKY. In punishment no terror lies; the terror
Doth lie in thy disfavour; in thy presence
Dare I use cunning? Could I deceive myself