Beam XdX Question

I am a little confused by the beam weapon rules of the B5 2nd edition rulebook, p. 190. It states...
Every hit from a beam weapon that causes damage deals the listed Armour damage, in addition to any other effects, but calculated after the damage of a barrage has been determined.

If I understand it right, that means you determine damage for the barrage as normal (i.e. generating Total Offence and subtracting Armour).

Then afterwards (even if no damage gets through?) you apply the XdX directy to armour... I take it that means the Armour value is reduced for the remainder of the combat?

So does that sound like the intent of the rules or am I missing something?