In the old game, after doing any attack, your character will stand in a battle stance posture for a few moments (it was probably like 3 seconds?) before going back to the regular relaxed standing posture. For warriors, they hold their weapon and shield (if they have one) out in front of them during their battle stance posture animation. All classes had their own version of that battle stance posture animation. Also if you were standing relaxed and a mob hit you, your character would enter that battle stance posture.

Currently after doing an attack and then stopping, you immediately go back to that relaxed standing posture. And if a mob hits you while you are standing still, you do not enter that battle stance posture.

Also in the old game, you couldn't change channels while currently in the battle stance posture and you had to wait until your character relaxed before you could change channels.