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for rogues, try retaliation + defensive stance with a sword and shield to weather their burst
Don't think this is realistic. Their burst happens while you're being locked in a stun. By the time you trinket out of that (if you even got the PvP trinket equipped or are lucky enough to be Human) and switch stances and weapons, the burst is over. You then have 20 seconds until the next possible Kidney Shot, not counting any Vanish + Cheap Shot, Blind or Gouge that might shorten the time even more. You either win the fight in that short time span after using your trinket, or you're dead for sure thanks to the next incoming stun that you obviously won't get out of anymore. Defensive Stance isn't helping with delivering some serious damage yourself, even more so since you'll rely on Overpower to make it happen. Also, you need/want the rage gained while the rogue is beating on you for your own offensive. Stance dancing seems awfully wrong in that situation.
Changing stance after trinketing the Kidney Shot would IMO only make sense to use a Disarm yourself. Not only will it drastically reduce incoming damage, but you'll also prevent the rogue from building Combo Points for the duration.
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use shield wall after they dismantle you
Can't use Shield Wall without a shield equipped, so unless it's a bug or oversight, you won't be able to use it while being under the effect of Dismantle. For this very reason I haven't even tried to do so. If it actually works even though it shouldn't, please let me know :)