"Very good!" complimented Ducane as Draco imbibed the horrendous-tasting potion, so Draco rolled his eyes again. "Since you’ve gone back in time a number of times now, the symptoms may arrive more quickly, and more severely. So we want to make sure we get this right, and hopefully you’ll never have to time travel again. Now, come: let me show you a few spells. It’ll hardly be useful if we send you back in time to diffuse a bomb without teaching you the diffusing spells, right?"