Turin.
First I'm going to start with a simple carification. There are Blocks and blocks. One is an action, and the other is a mechanic. And all actions must be declared. Most people are very forgiving on the declarations of "Moves and Blocks becasue they are simple and intuative, plus they are not limited to only 1 per turn." How-ever certain things trigger others, so it matters. I realize when you say "6 is blocking 5" that you mean "6 is taking a block action with 5 as the target".
In reality when you say "6 is stabbing 5" you mean "6 is taking a Block action with 5 as the target". No-one should be splitting hairs with you on the terminaolgy, but this of course has to be done here to prove the point.
(Pass, Blitz, Hand Off, Move, Block, Foul.)
A Block is an action. "I block him." "I move there" Again all actions must be declared as each miniature may only make 1 action per turn. He has Blocked, so he can not now Pass. He has already Fouled, so he may not Block now.
Now please, re-read what you quoted from me.
I very clearly said
1. I declare my blitz.
2. I move next to you.
3. I declare the target of the blitz. (Whom the Block action will be targetting)
4. Dump off triggers (if the target of the Block has the skill dump off).
I'll stop here for a moment.
That is how the rule works for EVERY BLITZ in the world that does not include a knife or chainsaw. Can we at least agree on that??
IF we can't then thsi will help us resolve the issue.
If we can lets move on.
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Now. Stab reads "instead of blocking you may stab". Which has been ruled that you replace the block with the stab. In the Block Action, you throw a block and roll block dice normally. How ever, stab lets you replace a block with a stab.
So when you get to "5" throw the block. You "replace the block with a stab and throw the 2d6".
If this were not true. And the above order violated. then why must I declare a blitz to move and stab ? Or to move and chainsaw? I'm not moving and blocking, so it is not a blitz.

It is because you are Moving and Blocking. Which by defenition is the Blitz Action.
It is establised that Multi-Block DOES work with stab. Are we sure there is not a FAQ about this? I unfortunately can not get my adobe acrobat working to open the files so I can point it out. Can any-one please confirm or deny the existance of said FAQ ?
Now blocking is just like blitzing with no movement spent. So the same thing applies. "I'm Blocking him, does he wish to dump off?" ok I'll replace the block with a stab. He still gets to dump off first.
(I apologize if this is not edited very well, and wish to ensure that it is stated this is not personal, I am just trying to be clear in my arguments as much as my poor English skills allow ok ?)