To Cassi's mind, the fire had been more than convenient. Without that, what they'd have would be a muggle in pain when he awoke with no obvious cause for it. That, combined with the loss of memory - wasn't that exactly what Pollux had warned her against? It would arouse suspicion. Fires were crude and unsubtle, but then so were most muggles. It was a complicated way to go about things, but perhaps it might give the best outcome?
This, she didn't say to Pollux. He didn't seem angry with her and she wasn't going to give him any reason to become so. Usually she could hold her own in a quarrel with him, but tonight? She wasn't at all up to it; she was exhausted and what she needed more than anything was his support. He was, to her relief and her delight, giving it, and so she only nodded as he spoke.
'I don't think anyone saw me,' she told him, lowering her voice a fraction. 'It was terribly quiet and terribly dark, on a stretch of road without so many of those lights. Besides if anyone had seen me there they'd have seen that the muggle threatened me, wouldn't they? And the alley was deserted. I did check that.'
Then Pollux spoke about her being out alone, and Cassi couldn't help it any longer, tears sprang to the corners of her eyes. 'How can you say that?' she asked him, now barely above a whisper. 'If I'd gone out in the evening with a gentleman you would have been furious with me. I'm trying to protect my reputation.' It struck her as so terribly unfair that he was criticizing her for having been out alone when he'd made his displeasure with the alternatives more than obvious to her.