Regeneration while dying in 4th edition

Question

I recently started DMing after playing 4th edition D&D around 10-15 times. While going over player and DM books I started to wonder if regeneration works while a PC is dying.

For example, a level 2 fighter by the name of Korgul is down to -2 hit points. In the previous round he used Boundless Endurance. Since his modifier for the skill gives +2, that is a regeneration of +4. This would mean that he would get to 2 hit points at the start of his round and become conscious? Or does the regeneration stop?

Well this turned into to 2 questions actually. First one is about regeneration and dying in general. Does dying count as bloodied in relation to Boundless Endurance.

To me, as a DM, if regeneration worked while dying it would seem overpowered.

Answer 1

Though you are bloodied when at 0 or less HP, you do not regenerate.

From the glossary entry for Regeneration ^DDI:

Heal Each Turn: If a creature has regeneration and at least 1 hit point, it regains a specified number of hit points at the start of its turn. However, if its current hit point total is 0 or lower, it does not regain hit points through regeneration.

From the Hit Points entry ^DDI:

Bloodied Value: The bloodied value of a typical creature equals one-half its maximum hit points. A creature is bloodied when its current hit points drop to its bloodied value or lower. Certain powers and effects work only against a bloodied target or work better against such a target.

Dying: When a character’s current hit points drop to 0 or lower, the character is dying.

Also, dropping to 0 or less HP ends a Stance ^DDI, such as Boundless Endurance:

[Stance] Duration: A stance lasts until the character assumes another stance or until the character falls unconscious or dies.