No shame in using auto-TMA in a torpedo-pinging situation to try and figure out where it is. Too many things going on for you to just focus on that. When the torpedo is launched, you may be able to see it on the broadband. If your sonar has a waterfall, you can watch the track of the torpedo. If it's maintaining a constant bearing (or pretty close to constant), there's a good chance the torpedo is heading straight for you. If it's blatantly veering to the left or right, odds are it was not shot at you.
The running at an angle is meant to minimize your active sonar cross section with respect to the torpedo. The optimum angle depends on torpedo speed and your evasion speed, but the ideal angle is around 120 degrees away from the bearing to the torpedo.
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