I ignore it and stay focussed on my task, once more I strengthen the Disillusionment on us and add a charm to remove the sound of our footsteps. I don’t know what they have been doing inside the Room of Requirement, even if the chance is small they could be Animagi and hide it very well, but I doubt it. Their scent would give them away and it hasn’t changed. Harry is probably teaching them to defend themselves against Death Eaters.