"Yes, well, you were in charge of the reno, brother dear. Guess you should have thought less about what colour tile to put in the loo and more about all the potential enemies you've made over the years."
"Or you could just try not letting my enemies escape from prison."
"Hey, stop it, you two," John said. He gestured at the laptop. "Back it up a few seconds and pause it right before the drone hits the window."
Mycroft did as requested, and John pulled the laptop closer, pointing at the screen. "It looks like it's carrying a smoke grenade, but not one I've ever seen before."
"Oh, yes, Dr. Watson," Mycroft said. "Pardon me, I had forgotten about the time you spent as a grenadier during your years in the service."
"Shut up, Mycroft. What do you know about it, hm?"
--six paragraphs from chapter 9 of Side Effects, coming to AO3 soon!!