Snape drew a deep breath, clamping down on the rush of scornful skepticism that was his instinctive reaction. He forced himself to remember that this wasn't that drunken fraud Trelawney, and then forced himself to remember that even that drunken fraud Trelawney had occasionally given voice to unfortunately accurate prophecies.
The track record of this Diviner remained to be seen.
Snape found himself hoping against hope that he was just an hysteric. But he'd never been one to rely on hope: his hopes almost always ended up dashed.
So, as soon as he'd finished reading the transcript, he said, "Do you still remember the vision clearly? I know sometimes Seers' memories are unreliable after the event. Sybill Trelawney was completely unconscious of her true prophecies - though I hear that different practitioners are affected differently."