Keep in mind that there is a nice theory about not being able to lie in parseltongue.
This line reminded me that Quirrel’s frequent transitions from man to snake and back seemed odd to me when I was reading. I went back to see if any of what he said after transitioning back to a man was a good candidate for a direct lie that he couldn’t tell as a snake. But I didn’t find anything. Most of what he said was phrased as speculation, rather than direct statements.
This line reminded me that Quirrel’s frequent transitions from man to snake and back seemed odd to me when I was reading. I went back to see if any of what he said after transitioning back to a man was a good candidate for a direct lie that he couldn’t tell as a snake. But I didn’t find anything. Most of what he said was phrased as speculation, rather than direct statements.