drink hot blood,
And do such bitter business as the day
Would quake to look on.
He has been sent for by his mother, and is going to her chamber; and so vehement and revengeful is his mood that he actually fancies himself in danger of using daggers to her as well as speaking them.
In this mood, on his way to his mother's chamber, he comes upon the King, alone, kneeling, consciencestricken and attempting to pray. His enemy is delivered into his hands.