I'm sure to remember when I reached St. Naz. and exit that patrol, that I had just 1 Allied ship sunk and the tonnage for that one (English, Coastal Merchant). The same as in my log during the patrol. No other sinkings were to be reported in the end mission screen.
It seems somehow that the English one, shooting at the C2 tagged it for his own. Could it be a possibility? Even though I couldn't really see any shell direct hitting the C2, somehow it may still have taken damage from it, enabling the Eng. light ship to bag the tonnage and claim it's sinking.
However still confused about stabbing his own convoy member in the back
I'll sure post if it ever happen again, along with screens.
/KiCk-AzZ