"Yes, although that's the conventional name. There's a lot of different types of plastic..."

And that gets deleted from his brain, because Watson just said something mind-boggling fantastical. "1892? I suspected that whomever brought us here might be capable of time-travel, but it's amazing to hear my hypothesis might have actual merit. You're really from 1892?"

Thankfully, César is so distracted by this that he's not only forgotten he's supposed to be feeling terrible but he's so easily led that Watson could lead him into a wall, and he wouldn't stop in time.