If someone is interested in making this run, here is a glitch i discovered :
http://www.dailymotion.com/video/x9eu3d_mass-effect-benezia-glitch_videogamesI apologize if the explanation is in french, let's translate to english :
-Take the shotgun
-Kill the first asari with a single shot
-Damage the second asari and run to the right tank
-let him explode himself
-glitch !
In the video, it is not really useful, but i think it can be done in another situation where it will.