Whisper pauses where she is, stepping aside so as not to stand out. They'd want to take possession of the prisoner at the least, and they'd probably have some questions for the ones he'd been after as well. She wasn't sure if they knew the fight had moved to the roof of the train cars, but if they did there'd be no place to hide.
She had to stall them, if she could...and simultaneously warn the others.
So as the pursuers came closer, she leaned out and asked, "Excuse me, what is all this ruckus about? I was trying to sleep and suddenly...pandemonium!"
Meanwhile on the roof of the train a large black bird winged its way out of the train car Whisper had been in, struggled to keep up with the train for a moment, then managed to land on the roof as well. With obvious difficulty it scrabbled over the roof against the headwind to arrive at where the others were gathered. A big black raven that eyed them and croaked, "House Orien has men coming. Whisper is trying to stall them...she is not sure if they know where to find you."
(OOC - Go go sorceror familiar!)