I'm not exactly sure how Temporary Hit Points work in Pathfinder but here's what the Talent states:
Once per day, a rogue with this ability can gain a number of temporary hit points equal to the rogue's level. Activating this ability is an immediate action that can only be performed when she is brought below 0 hit points. This ability can be used to prevent her from dying. These temporary hit points last for 1 minute. If the rogue's hit points drop below 0 due to the loss of these temporary hitpoints, she falls unconscious and is dying as normal."
I'm assuming that means that if I were hit by something for 10 points of damage and I'm only level 7, my hit points still fall below 0 to -3 and I'd still be unconscious. Or does it mean that, after the hit, I receive these hit points and they last until depleted or the 6 rounds have gone by?