[Ford's mind is made up in a split second. He reaches into his coat and pulls out a thermos. He uncaps it, dumps the contents of the teapot inside, and closes it up.]

You can drink it on the way.

[He pushes the thermos into Jon's hands, gets to his feet, and heads for the door.]

That magic residue won't hang around in the air forever! Come on, there's not a moment to lose!