Hermione heard Theo's words but didn't turn to watch, keeping her focus on the bleeding death eaters before her, she knew Theo would protect their side. She didn't need to watch as he shot her favourite  furnunculus  curse at his father. She didn't need to turn her head to see the rage in Nott Snr's eyes, she could feel the rage like a tangible thing, filling the alleyway with disbelief at his son's actions.