The use of one or two blasts on the fog horn to tell which tack the sailing vessel is on is required under foggy or other reduced visibility conditions (Art. 15). That was not the case that night. Moore kept out of the way of sailing vessel by following the rules under Art. 20. Under the explanations for Art. 20, they state:He also said his sailng vessel gave a blast on her foghorn which means " I am on the starboard tack." This again tells us a little.
That is exactly what Moore did. The sailing vessel was crossing showing her green light. Moore turned his ship to port to pass starboard-to-starboard. He also reversed his engines for short time to fully avoid collision, again in accordance with the rules of the road that was then in effect.
As far bringing up the Samson, that story has been discredited a long time ago. She was not anywhere close that night.