Health: Wrong. If you want someone to have a Din Treifa, there needs to be a P’sak Din L’misa. Would you call every Ba’al T’shuvah a Treifa? Heck, you just made the whole world Treifos, now it should be Muttar (Al Pi the Minchas Chinuch) to kill anyone to save your own life. Yasher Koach! You removed Mai Chazis.
DY: The goal might have been to get him on the ground. The outcome was that he was killed.