[quote=@Prince of Seraphs]
<Snipped quote by Lucius Cypher>

Well the least he could have said was that she had a vanishing semblance. Which he does know about given that she demonstrated it in front of the entire combat class.
[/quote]

Nah, Shiro doesn't quite understand and is confused by her Semblance. Because all of his senses says that she's still around, but something is saying she's not and it fucks with him. He actually thinks she has some sort of 'Dark' Semblance.