They met up with the others in a passage on Hogwarts’ ground floor without incident, re-joining the small group – Lupin, Shacklebolt, McGonagall, Potter, Weasley and the Weasley twins. Johnson, who had been left at Aberforth Dumbledore’s was probably still trying to get back into the Room from the Hog’s Head and not realising why it wasn’t working anymore. Poor witch was probably panicking, thinking they’d all been killed.