I thought the whole idea was that she couldn't read Brutus' mind *while he was unconscious*. She can see and hear what he perceived, but she can't understand the sounds in and of themselves.
But once he wakes up, if she tries to read his mind, the memories will be augmented with his conscious understanding of them, and she can perceive his thoughts and conscious understanding.
Just like when Natani speaks to Reni, even though she can't understand their Keidran words, she can understand their thoughts and intentions that accompany them.