Snowfire
Polyglot of Chimera
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I was thinking the same. Viserys isn't one to show his emotions that openly, and has a standing bluff of +41.
So either Harry was absurdly good/lucky here, or Viserys wants him to be able to read what he is reading.
Harry is, in fact, a trained and pretty damn good investigator. A high Sense Motive basically comes with the territory - most of the books only cover the occasions where he rolls entire strings of 1-3s on key checks. And moving into 'I am ready to cast' mode is pretty obvious to anyone who knows how you do it. Harry does.
Tl;dr skill checks are not something continuously rolled and don't necessarily apply in a vacuum. Circumstance matters too.