Don't face Strix head on. Pouncing head first may result in a (skilled) Strix sniping you up close, if caught in his scope. Sneak behind him and lower his HP with your knives. Once he knows you are there, pounce on him to finish him before he hides.
Using the bubble talent with DR and some life rip can make you tougher to kill , if a flank is next to you he is going to fight you w damage of the bubble , your selfsustain and DR (15% minimum)