It's a poison that's communicable. Like poison ivy. [The most annoying poison... except for this one. Poison Joke is a hundred times worse.] They're looking for a cure at the moment.

Doc Brown's got a lab set up, and I know Don was trying something along with Zecora. If you think you can run, we might be able to get there in half an hour or so.

[Because at a 'walking pace', they might be there in half a day.]