Though he suspected it was dangerous to swivel his head around while Lavender was still brandishing scissors very near his eyes, Neville couldn't help but feel a little anxious at the exchange between the two Gryffindor girls and wanted desperately to have a look around the room for someone to come to his aid.
He also didn't consider it wise to remind Lavender that he hadn't wanted a haircut at all, and so he kept quiet, hoping that whatever was between Lavender and Parvati regarding Seamus would resolve itself without injury.