Ah yes. Maybe I only saw it after black knight to c6 and white continued with the knight exchange for bishop and then the black bishop retreat to d6.
considerng that white should play g3 after or very close after bxf6 i fail to see how bd6 is dangerous even if you add c6 and a queen move.
After 4...Nc6 Hansen recommends 5 d4.
I see you haven't gotten his book yet.