Zoravec had no idea how to respond to the particular situation. He could clearly see his shirt and mouth tainted in the blood, he reflexively touched the neckline of his shirt only to confirm that the red liquid was indeed blood. Zoravec was unable to comprehend how did it even happen and was it a permanent effect.
"How did it even happen? I can't…did I kill somebody?"
Zoravec was unable to accept that he might have killed somebody if he went out. Because his powers were unstable and if he actually attempted sleep walking then he must have murdered somebody.
The conclusion was derived from the previous event which occurred with Lyra. Zoravec admitted that his powers were capable of potentially injuring everybody. It shocked and horrified him regarding the possibility that he might have actually drained somebody.