From the original e-mail, I am assuming that you're in the Kilo.
Part of the problem for the Kilo is that it does not have much speed to get out of the search cone of an enemy torp.
It would be helpful though, to know what sort of torpedo we are talking about and from what distance it was launched. RA rates torpedoes individually for features like "decoy logic recognition" and "target reattack option".
As an example, the Mk 48 ADCAP entry in the RA Weapon Guide states the following for Decoy Logic Recognition: "It is meant that the torpedo is not absolutely insured from targeting on CM's. For example - if range between torpedo and CM large, the torpedo will not distinguish CM, accordingly, she will be targetting on CM. However - in the process of reduction of distance up to a CM and increase of strength of a signal, the torpedo will distinguish CM and to reject her from attack. The acoustic conditions, also can influence distance on which CM will be distinguished steadily. In general, it is possible to say so - than closer to CM the sensor control on a torpedo will be switched on, especially probability that a signal of a CM will be high on the level, and CM will be at once rejected from the valid target."
Russian to English translation issues aside, what I think that means is that if the shooter has a good solution and enables the torpedo close to the target (and any countermeasures it likely dropped), the CM is not likely to be effective. Clearing datum is critical if a torp is fired at you in RA, and the Kilo is not that good at clearing datum.
Older torps without (or perhaps with worse) decoy logic will likely be easier to avoid. Since it decoy logic appears to rely on the torpedoes own sensors, the quality of those sensors will likely also affect how will it will reject CMs.
Mike
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