Zerker charge vs concealed guys

[Eagle4ty]

Good point.
I presume that A8.312 ("TPBF: An armed, unbroken Infantry DEFENDER not in Melee must after all Residual-FP/minefield/OBA attacks then immediately attack any Infantry/Cavalry MMC unit that enters its Location during the MPh whether it uses Defensive First Fire, Subsequent First Fire, or FPF") was the reason that had you not leave the squad concealed, but allowed you to keep the leader concealed?
Wouldn't the leader have to direct the TPBF DFF? Or could that be considered not being a (mandatory) attack?

Another situation to ponder if the concealed unit must fire: What if the unit stacked with a concealed Ldr was broken when the 'zerker entered its location? Would the Ldr then have to make a TPBF attack and lose concealment even though it can't technically fire?