As a general rule, I do the tma to get a reasonable solution before I fire. At some point he's gonna begin maneuvering evasively, and by then, all bets are off as far as TMA and me are concerned. Then, it's guidance and bearing differences all the way.
My answer to the original post, is more or less documented in the ffg guide I wrote; generally speaking, the first thing I do on getting the TIW warning is to maneuver so as to invalidate the solution it was fired on (presuming it was fired on me, etc etc) then to determine the type and direction of the torpedo. Location is also important, but not to ownship survival.
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