Harry just rolls his eyes as neither him, Nightmare, or Hermione notice Neville freeze up with his eyes widening. "Come off it Hermione. Snape would never try to kill me with something so obvious as jixing my broom in the middle of a match with him standing up and a wand in his hand." He then waves his hand as Neville turns towards them panicking. "If he actually wanted to kill me, he would likely use a poison in my food that would be undetectable and likely have symptoms akin to food poisoning or an allergy so no one would think about the possibility of poisoning." He then frowns thoughtfully. "Perhaps something that would decay rapidly with warmth so that the heat in my cooling corpse would destroy it."
All of a sudden him, Hermione, and Nightmare (as well as Luna) stiffen at a familiar voice. "Indeed Potter." They slowly turn to see Snape looking at them with a raised eyebrow. "I would never do something as obvious as jinxing a broom in full view of people." He then looks at Hermione with a small glare. "Ten Points from Gryffindor Granger for your accusations." He then turns and takes a few steps before stopping. "And five points to Gryffindor Potter for correctly theorizing a method by which I would kill you."
Watching as the potions professor walks out of view, Harry becomes thoughtful before looking at his friends. "I'm confused as to whether I should be amused by what happened or paranoid and worried that he agreed with me..." He then scratches his chin as Hermione and Neville stare at him. "Of course, he's unlikely to use that method now that he's admitted that it would be one way he could kill me." He then frowns. "Unless of course he wants me to think that so that I'll let down my guard and because no one would think that he would use that method due to what just happened..."
At that moment Tonks walks up and sees the stares and looks at Harry. "Wotcher Harry." She then jerks her thumb at Hermione and Neville who are still staring ludicrously at Harry. "What's up with them?" Harry tells her what happened and his thoughts only for her to give him a deadpan look before her enlarged hand covers her face in a facepalm. "Gee, I wonder what might be wrong with them..."
Amused by the whole thing, Nightmare leans her head against one hoof. "The world may never know."
Harry ignores the glare as he sighs. "Do you guys think that if I added methods of him killing me to my essays that I might get better marks?"
Hermione and Tonks exchange a looks before the metamorphmagi's hand comes up and slaps Harry in the back of the head, with the same answer coming from both her and Hermione's mouths. "No."
Hovering in midair, Luna can only shake her head in amusement. "Only you Harry, only you..."