Harry watched and waited, he ignored the talking of his fellow housemates, he just watched, just waited until Neville moved. Finally he did and luckily for Harry he left on his own, moving quickly Harry followed him. Staying just behind him until they had travelled far enough away from the main hall that no one was likely to interrupt them, he needed to start the conversation before Neville could make it too wherever he was going, most likely the common room.