When Rogozhin quieted down […] the prince bent over him, sat down beside him, and with painfully beating heart and still more painful breath, watched his face intently. […] Time went on—it began to grow light.
Rogozhin began to wander—muttering disconnectedly; then he took to shouting and laughing. The prince stretched out a trembling hand and gently stroked his hair and his cheeks—he could do nothing more. His legs trembled again and he seemed to have lost the use of them. A new sensation came over him, filling his heart and soul with infinite anguish.
Meanwhile the daylight grew full and strong; and at last the prince lay down, as though overcome by despair, and laid his face against the white, motionless face of Rogozhin. His tears flowed on to Rogozhin's cheek […].
At all events when, after many hours, the door was opened and people thronged in, they found the murderer unconscious and in a raging fever. The prince was sitting by him, motionless, and each time that the sick man gave a laugh, or a shout, he hastened to pass his own trembling hand over his companion's hair and cheeks, as though trying to soothe and quiet him. But alas he understood nothing of what was said to him, and recognized none of those who surrounded him. (4.11.147-150)
What a totally amazing ending to that scene! Not only is Myshkin doing exactly the same thing to Rogozhin he did to Nastasya after the confrontation with Aglaya, but we also get the picture of the two men through the eyes of the random strangers that find them. The image is of purity embracing straight-up evil, and both are entirely lost within their minds. Whew!