Thats how the skill works atm:
1) You cast DA, your warp heat is increased and capped.
2) Enemy makes a lethal shot, your HP and Suppression are restored (just like in the skill description);
3) Your warp heat doesn't increase at all (although in skill description it says +65 on triggering);
4) Buff icon stays, warp heat STILL capped, skill doesn't go on Cooldown - seems like it is still working (however you can reduce CD by 10% with every hit of force weapon - there is indeed relevant skill in the Movement tree);
5) when enemy makes lethal shot again - you die.

To sum up: basically, when DA triggers, it can't be recast and doesn't function properly, until you die and respawn.