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[Pyrex]

Link to Errata.

Relevant bit:

Originally Posted by WotC

Whenever you hit an enemy with a melee or a close attack, you gain temporary hit points equal to your Constitution modifier, plus any temporary hit points normally granted by the power.

If you use an invigorating fighter attack power and miss every target with it, you gain temporary hit points equal to your Constitution modifier.

No more stacking. No more multiple-bursts of THP when you get hit. Pretty serious nerf.