I don't think ANY of the above.
1) after I fired a single torpedo and dropped the periscope to beat a retreat. The 'scope was visible above the water for a short period. Also it was early in the war so no radar.
2) Although it was a steam-powered torp, I very much doubt the destroyer that was 2000 yds infront of the one I hit would be able to get within 100 yards of my firing position even if the other one said the bearing which it came from.
I think this is an in-game issue, not anything true-to-life or historical.
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