I'm thinking you can as well, I just wanted to confirm. The whole "carry out abilities completely" thing really confuses me. It's tough for me to see how you can play a negate once some abilities are carried out (e.g., discarding the hero you want to play the negate on).
ETA: ASKED AND ANSWERED IN ANOTHER THREAD
The ability carries out completely because it does not cause a hero to be taken out of battle. It is not negatable by something that negates enhancements, but if something negates CHARACTER special abilities in battle, it would then revert to an enhancement.