Chapter 3. Timing is the key.
"Quieten down please, students." Dumbledore said calmly and everyone started to quieten down, wiping tears of laughter from their eyes, "please keep to your assigned partners or you will be covered in blisters and boils. If you think I'm joking, well give it a try. The missions shall begin now! Oh and Heads, uh wherever you are, I expect you two to cooperate as partners in this project, keep everyone together and aware of what they must do. Now, good luck, everyone!"
'Damn! Anyone but I.F.' thought Hermione as she grudgingly made her way over to the Idiotic Ferret, ' it's bad enough sharing the Heads dorms…' They walked over to McGonagall in awkward silence.
" As I read out the pairs you'll hand them one time turner. Do you think you can do that without killing each other?"
" Yes, professor." Hermione answered. 'Not bloody likely' she thought as she grabbed a fistful of time turners.
" Miss Bulstrode, Mr Goyle."
"Miss Brown, Mr Weasely."
" Miss Parvarti Patil, Mr Finnegan,"
"Miss Abbott, Mr Potter."
"Miss Padma Patil, Mr Goldstein."
Soon everyone had a time turner and a partner.
" I can't believe we have to go together, even in this. It's utter madness…"
"Hush, Malfoy! I'm trying to hear the instructions." Hermione hissed at him.
" Yeah and I'm stuck with you! Who has the more reason to complain? ME," he hissed back, in her ear. She swung her hand back and smacked him on the nose.
" owwwww! Goddammit woman!"
"Serves you right! Now shut your trap."
"… About 13 turns should do it. Now please place the chain around your partners neck and your own. Don't worry, there are no such thing a cooties. Once you've done that start turning, and remember never tell anything about this cla…" Dumbledore's eyes twinkled merrily as the clinking of chains drowned his voice out.
Hermione began turning one…two….three…four…five….six….seven…eight…nine…ten…eleven…twelve…thirteen…fourteen…fifteen….sixteen
" hem hem. Granger!"
" seventeen…""Hermione!"
"What do you want? Seventeen…? No eighteen." Hermione kept turning.
" Granger, exactly how many times have you turned that thing?"
" nineteen… twenty… twenty one…"
" what happened to thirteen turns?" he asked weakly.
"shit-shit-shit-shit!" Hermione started panicking before they knew it the familiar feeling of apparition came upon them and they started twisting on the spot.