Timing of the Shard on a Truth of a Thousand Lies

If a player who does not currently control the edge bleeds with a minion.
Manages to bleed succesfully, can he use the Shard to reduce the cost of a Truth of a Thousand Lies to unlock during that action?
I guess its the perception when do you actually get the Edge. Just wanted a clarification thank you.

Name: The Shard, London [FoL:1] Cardtype: Master Cost: 2 pool Unique location. If you have the Edge, you can lock this card to reduce the cost of a card you play by 2 pool or blood. Vampires can steal this location as a action; Ventrue get +1 stealth during that action. Artist: Felipe Headley

Name: Truth of a Thousand Lies [KMW:C, LotN:PS2, POD:DTC] Cardtype: Action Modifier Cost: 2 blood Discipline: Serpentis [ser] Only usable during a bleed action. +2 bleed (limited). [SER] Only usable after resolution of a successful action. Unlock this vampire. Artist: Jeff Holt

Thanks so much for the clarification.