http://www.games-workshop.com/gws/content/article.jsp?categoryId=1000018&pIndex=1&aId=3000006&start=2I don't know if any of this will help, but here is what the FAQ says:
Page 39 – Countercharge
Change to “In the enemy’s Movement phase a detachment that
is in close support, and that has not been charged itself, may
countercharge an enemy unit charging its parent unit. The
countercharge is made at the end of the Charge sub-phase,
after all normal charges have been carried out. Make the
countercharge using the rules for charges. However, if the
detachment can draw a line of sight to an exposed flank of the
enemy, and is within charge range of it, it can charge it in the
flank, even if it would normally have to charge its front.”
Page 39 – Supporting Charge
Change to “In its own Movement phase a detachment that is in
close support, and that has not yet charged itself, may make a
supporting charge against an enemy unit that has been charged
by its parent unit. The supporting charge is made at the end of
the Charge sub-phase, after all normal charges have been
carried out. Carry out the supporting charge using the rules for
charges. However, if the detachment can draw a line of sight to
an exposed flank of the enemy, and is within charge range of it,
it can charge it in the flank, even if it would normally have to
charge its front.”
Page 39 – Figure 2. Supporting Charge
Change the second and third sentences in the paragraph at the
bottom of the diagram to “The parent unit declares a charge
against the enemy unit. The enemy holds its ground, and then
at the end of the Charge sub-phase the detachment declares a
supporting charge.”
Q. When an Empire parent unit is charged in the enemy Magic
phase, are its supporting detachments allowed to react with a
countercharge? (p38)
A. No.
This is everything the FAQ has in it about supporting and counter charge.