Tchagine did indeed commit suicide. HOWEVER it was not over this incident. He shot himself the evening of October 11/12 (OS), 1912. He had never married, and earlier that season in Livadia, he had a sexual affair with a much younger girl. She and her parents followed him to Petersburg, demanding something be done. His only option was to marry her, and for that he needed the Emperor's permission. He resolved to go to Spala and explain everything to the Emperor and let the Emperor decide what to do. He could not face the disgrace before the Emperor, who considered him to be a very very close friend, and so he shot himself.
See Spirdovitch, Vol 2, Ch. 12 "The year 1912"
Harald, the correct term in English is "Rear-Admiral".
Douglas, quite the opposite actually. The IF felt very much at home on the Standardt, and the officers of the Standardt were some of their closest friends. The IF had no reservations whatsoever about "mingling" with the sailors. In fact, the youngest sailors were often Alexei's playmates on their voyages. They often spent entire evenings playing games after dinner with the Standardt officers not on duty.