In one of the last levels of SP DA, when you don't kill hisham, you get somthing from him. A thing that cant stop your bleeding when you bleed to death. Can u use this ting in the later missions, for example to safe enrica.

Like in Hitman, when you're dead and you think the game is over, you can stand up and play one last mission

To say the truth, I really didn't need that thing...
And the only feeling I got from Hisham is that he can be the next Splinter Cell operative, in case Fisher cant't clean his name in the next game...that's my conViction...

It depends on what version you are talking about.

If you mean the XBox version...

There is NO saving her.

ok...what?

Yeah, I wondered this too. Are you playing it on an old gen or new gen console?
If it's old gen, it won't let you.

Ok i think i know what your talking about... In the Old gen kinshasa level, when you save hisham, he gives you this syringe... No Sam isn't a druggie...this syringe i think will revive you if you don't escape the room with the red mercury in the HQ level... I haven't tried this my self, but this is what ive heard

I acctually forgot that you get that....in fact I have no idea where it is in my kit or anything....