Well, Susan has a theory.
I'm pretty sure Sherlock Holmes wouldn't stick his nose right in someone's neck. He'd smell them from across the room.
I would say more like Professor James Moriarty...
Both Holmes And Moriarty would already know the answer
I mean, how many Linages are there, with telepathic sorta-fraternal sorta-twins
@BattleStarX: Well, the ORIGINAL Holmes probably wouldn't. Most modern interpretations of the character tend to to up the "eccentric jerk" aspect and lower the "heroic gentleman" aspect.
@Merrsharr: I'm not sure he noticed; that was quite in an aside moment between the two girls. It could be swept under the storytelling rug, and the two girls accompany each other under another relationship.
...Seems too obvious. Then again, if the rules of funny are still clinging to them, it would be appropriate. :,D
Like any good medical drama, the first diagnosis is always wrong. Who else is Holmes-like in their skills? Moriarity, of course, has been nominated(And is much more likely to try strangling Susan, isn't he?)
Also: Holmes eliminates the impossible, not the unlikely ("nobody has a Dam")