Partial transfigure air at wand tip into Sarin gas (which I'm sure Harry knows the chemical structure of). Heating it will help it diffuse faster. Hold breath. But not before telling Voldemort something true put possibly useless (like the special power is "love" or something). I'm fairly certain that voldemort would feel the need to respond to this, explaining why it is a stupid answer. You have to inhale to talk. After that, make for the time-turner I guess?
Transfer something into non-toxic gas, wait for everyone to inhale it, then dispel the transfiguration. It's faster.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 113.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
IMPORTANT -- From the end of chapter 113: