"I know the alphabet." Shrieky replies, a little curtly, "But you need to show me which word it is you're reading out, or I get lost."

That's right, Tyrion, you have to put your finger under each word as you read it, or he can't follow along. It's the only way. When Tyrion falls silent, Shrieky turns to look at him, to check if there's any immediately obvious reason why he's no longer providing a commentary.

"Is there something wrong?"