「Warning: When two or more individuals who have been infected by the monster enter close proximity with each other, the monster becomes restless.」
Reading the warning section of the quest one more time filled Merlin with a sense of dread. He interpreted this as the ghost becoming more aggressive. Its behaviour up until this point felt more like it stalked its victims, giving them a grace period before attacking. But now it was possible that he'd be attacked immediately after leaving the town that now acted as a safe zone.
He checked on Sir Redmond's condition, only to see that the man also seemed to be in pain, but before he could say anything an ear piercing whistle rung out from outside the building, grabbing the attention of both Merlin and Sir Redmond. The two turned to face the window towards where the sound seemed to originate from.