Wow," the empty air finally said. "Wow. That puts a pretty different perspective on things, I have to say. I'm going to remember this the next time I feel an impulse to blame myself for something. Neville, the term in the literature for this is 'egocentric bias', it means that you experience everything about your own life but you don't get to experience everything else that happens in the world. There was way, way more going on than you running in front of me. You're going to spend weeks remembering that thing you did there for six seconds, I can tell, but nobody else is going to bother thinking about it. Other people spend a lot less time thinking about your past mistakes than you do, just because you're not the center of their worlds. I guarantee to you that nobody except you has even considered blaming Neville Longbottom for what happened to Hermione. Not for a fraction of a second. You are being, if you will pardon the phrase, a silly-dilly. Now shut up and say goodbye.