Precise strike and Telling blow

[S_Grey]

Would you allow a player with precise strike and telling blow, to on a critical threat and only a critical threat (no flanking, target not flat-footed), utilize precise strike? Why?

Precise Strike
Precise Strike
Type: General
Sources: Dragon #310
Dungeon Compendium Vol. 1

You are skilled in finding your opponent's weakness and striking where it hurts most.
Prerequisite: Dex 13, ability to sneak attack
Benefit: When making an attack that would qualify as a sneak attack, you may take away any number of dice from your sneak attack damage and add a +2 circumstance bonus to your attack roll for each die reduction you make. You may convert as many of your dice from your sneak attack damage as you wish in this manner. However, if you make more than one sneak attack during a round and are using this feat, you must convert the same number of dice for each one.

Telling Blow
Telling Blow
Type: General
Source: Player's Handbook II

When you strike an opponent's vital areas, you draw on your ability to land crippling blows to make the most of your attack.
Prerequisite: Skirmish or sneak attack ability.
Benefit: When you score a critical hit against a target, you deal your skirmish or sneak attack damage in addition to the damage from your critical hit. Your critical multiplier applies only to your normal damage, not your skirmish or sneak attack damage. This benefit affects both melee and ranged attacks.

[WhatBigTeeth]

Provided the character has already confirmed the critical to trigger telling blow, I'd give the player any attack bonus the player wants. The enemy isn't going to get any more hit.

EDIT
But looking at the rules involved, even disregarding overly anal nitpicking like that adding sneak attack dice to damage could be different than actually sneak attacking, telling blow doesn't make an attack qualify for SA until after the attack roll is resolved, and precise strike only works before the attack roll is made, so they wouldn't really mesh.

I could see a generous DM allowing PS to benefit critical confirmation rolls, but otherwise, it looks like a headache of fundamentally incompatible abilities.

[Siosilvar]

Telling Blow isn't a sneak attack until the crit is confirmed. Precise Strike adds to the attack roll, so it's a bit late.

So, Teeth is right.