they are so hard to kill. in file R-O2 i had a hard time killing the 3 mastiffs in this one part. i could not kill them unless it was a stealth kill. i had to redo this part over and over until i manged to kill all 3 with stealth kills. if one saw me, i would get beat. i am sure there will be more of these mastiffs in later levels. what is the best and/or easiest way to kill them?