Libero setting from front zone "extension"

A question about a detail in the libero rules. FIVB (and USAV) rule
19.3.1.4 says:

| A player may not complete an attack hit from higher than the top of
| the net, if the ball is coming from an overhand finger pass by a
| Libero in his/her front zone or its extension. The ball may be
| freely attacked if the Libero makes the same action from outside
| his/her front zone or its extension.

What exactly is the "extension" of the front zone that's mentioned
here? Everybody I've talked to thinks that it's simply the part of the
free zone between center and attack line, but I'm not quite convinced
because strictly speaking that's still part of the front zone itself,
according to rule 1.4.1:

| The front zone is considered to extend beyond the sidelines to the
| end of the free zone.

So I'd reckon that any extension would have to go beyond that - in
other words, if the libero finger-sets from beyond the scorer table,
I'd consider a subsequent attack hit over the net illegal. Okay, not
that that happens often, but still: Am I reading too literally there?

/HW
.

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