So thematically what is different between the two examples?  The only difference is in the B-t-B contact then?  This goes back to another thread I had posted on where the counter-charge was brought up.  I find that the same quirk in the counter-charge rule being responsible for two strange occurrences to be illuminating.
What would happen if formation A were allowed to Firefight against B2 after countercharging toward them?  I'm not pro or con on the topic, just asking if that would resolve the problem.
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Here is another question: In Hena's example, it appears the closest
units in formation A to B2 should charge in the direction of B2.  HOWEVER, the units from formation A that were closest to B1 should have charged in the direction of B1.  Unless you have a long thin line of single stands being precisely assaulted from opposite directions that have a 1cm difference, this should never have happened.
Units from A should have counter-charged toward the closest formations, which would have resulted in formation A splitting in two (or at least starting to).  Even if they bottom units (the ones closest to B1) didn't move at all, the assault would have continued.
EDIT Nevermind. I went back and looked at the pic and the "long thin line" is exactly what happened. Move along, nothing to see here!

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author of Syncing Forward and other stories...It's a dog-eat-dog world, and I've got my Milkbone underwear on.