Yes, I get what you're saying. I guess what I'm asking is this:
Model A wants to take a Walk action, which will take him through the melee range of Model B, but would end with him outside of said melee range.
Now, if they had been engaged at the beginning of Model A's activation, Model B would get a disengaging strike against Model A after they declare their intention to Walk away. If Model A loses the duel, he will be Paralyzed, remaining engaged with Model B and losing all action points.
As I understand your take on this, if Model A does not start his activation engaged with Model B, but his declared Walk action would take him in and out of engagement with Model B, before Model A takes his movement, Model B get his disengaging strike against him. If Model A loses that duel, he stays where he is and loses his remaining action points.
The part that doesn't quite sit right for me is that in that situation Model A would not have ever come into contact with Model B, where normally they would have started out close enough for Model B to do something about Model A leaving. I think in a case like this, where Model A would be prevented from disengaging with Model B, they should perform the Walk action until they enter engagement and then put the Paralyze into play.