You shouldn't feel overly threatened by submarine torpedoes in a battleship. Their homing ability stops at a far distant away from the ship, so there really does tend to be a lot you can do to mitigate outside of being caught flat-footed and broadside.
I made a video a long time back which explains the mechanics the homing torps use.
Direct Video Link: https://www.youtube.com/watch?v=U1hL9yioEF0
Please drop me the replay so I can check it out and see if there was anything that could have been done.
Yes, most of all of my videos were just clipped explanations from my live stream. You may have caught it being recorded live, though I did start recording replay reviews offline more recently as I don't stream nearly as much anymore.
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1) Juking Torps is nearly the exact same concept as Shell Juking. You fake a direction/heading you'll be at, then bait a shot and alter your course/speed. For homing torps, you bait a direction until they are about to lose homing/have lost homing and then deviate. It's literally the same concept.
I have a video on shell juking I can list. I'll do that at the end of the post.
2) You're basically describing a crossfire or a multi-threat situation. It's extremely dangerous to deal with crossfires as you will show more of a target to one enemy or the other. Worse if you have a citadel that can get you crushed (IE: not in a DD). Always worth remembering that you are only a single player and are not expected to win 2v1s or other situations where you are outnumbered.
You can shell and torp juke while just moving forward/backward, so it's not that 90 degree turns are required. The less room you have to maneuver will mean your maneuvers are less likely to be effective, though.
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Direct Link: https://www.youtube.com/watch?v=wwWOxYn59JA
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