Dear Anonymous,
Yes, this is an uncomfortable position to be in with two enemies facing you at the same time, attacking from different directions. The key here is to take them both out simultaneously, quickly and silently so that they do not alert any other sentries. When they attack one of them will be a fraction quicker than the other, concentrate on this one, or if the attack is simultaneous then concentrate on one of them. use your posture to manipulate yourself in line with both, putting the first assailant between you then take them out with a combination of arm locks, knee strike and throat slashes. Finally silence both with a blow to the carotid artery and make your escape under cover of darkness.