The torpedoes are not neccessarily aimed at you. But to other units in the area the shooter deems is an enemy. That includes neutral units.
Depending on mods used you are simply stuck in a spot where the quick mission is incorrectly sized for the changed sensitivity of your and enemy's sensors. Quickly slowing down to lower your loudness might stop them from shooting at you. But you can always get caught in the middle of things. Since you don't know immediately where a contact is, or what it is, there is no quick-shot method to be top-dog. It should not happen in the first place. At least not that quick. The quick missions are borked. Ofcourse you can always turn on the truth-layer to know where they are, but where is the fun in that?
The download section has a number of moddified quick mission regions. I think they were modified to fix these shooting-spree festivals. But I am not sure, and the description does not mention.
http://www.subsim.com/radioroom/down...do=file&id=308