Just after listening to Snape's report, Dumbledore was pacing back and forth in his study.
Agreeing to Lockhart's proposal to host a Duelling Club seemed to yield far more than expected; even he hadn't anticipated that Harry was actually a Parseltongue.
In Dumbledore's memory, none of the generations of the Potter family had ever produced a Parseltongue, and the ability Harry possessed was clearly not inherited.
Chapter 533