Yotnar looks at the blood with a grim expression. When the party discovered that the exterior of the asylum was flooded with abominations, he had done his best to keep everyone's spirits up. But now he himself was starting to have doubts.
The pool of blood in front of him almost seems like it was intentionally placed there, just to remind him how little he understands about his situation, and the dangers waiting in this wretched place.
Yotnar finds himself overcome with a combination of anger, frustration, despair, and fear. He voices those emotions all at once with a single utterance:
"B@+$++!s."
Then, having said everything that needed saying, he starts to search the room, looking for clues to whose blood this is and who (or what) spilt it.
Perception (+2 to notice aberrations): 1d20 + 9 ⇒ (11) + 9 = 20