Yeah hard one alright. He chould suck it up and speak to his Staff Sergent that is in charge of him to go on light duties for a few days as he is not in the right head space at the moment.
You could always tell him I feel the same way in a way as Nigel is in Waiouru and I am here all by myself and struggling but I just suck it up some days and deal with it - there are the odd days I don't but we are all entitled to those days.