You all have some great/humorous responses. 
Here's how I would've responded:
Cassandra: You walked out of the fade...and you have no idea how you survived?
Cassandra: At this moment, you are the only threat I see!
Inquisitor: *stares blankly...*
Inquisitor: Ha! I'm flattered, really! *then leans in closely*
Inquisitor: But, compared to those things coming out of the Fade? *shudders at the screeching sounds* I should be the least of your worries.
Cassandra: *violently shoves him away*
Inquisitor: Now then, which way did the unicorn go? I was going to sell him to one of those bloody Magisters in Tevinter.
or
Inquisitor: You know, the Pride Demon said the exact same thing when I walked in...
Inquisitor: Any relation, by chance?
Cassandra: *glares menacingly*