'@ jldjs: Had you just been "discovered" by him and one of his buddies by chance? They may have "cut" their engines to listen for you and try to get a "fix", after charging toward your assumed location at Ahead Flank."
No, just the opposite. I was notified he was at bearing 90 as a visual, he then was going 6 Kts, he slowly turned towards me at about 19K yards and closed to about 2500 yards and accelerated to 15 Kts. After snapping the image, I put him on my 180 bearing let him close to about 1000 yds, zigzaging, and disposed of him from my stern tube.
