Eeep! Myrtle! Where?

Oh right, plan. There was also the excuse of 'Jacob being Jacob' which has seemed to work for almost everything else.

Jacob listened closely for either for footsteps or a shreik of pain from some potion mishap. Then again, Patroclus was rather good at potions, so if that were to happen then Jacob certainly wouldn't be able to fix it. And the entire plan would collapse.

How optomistic.