Few things 1) don't bring a knife to a gun fight 2) why SPD does not provide every officer with a tazer as pathetic when they spend so much money on things like homeless tzars and safe injection sites. 3) this is a sad situation but the cops did what they could do with the situation.  You pull a knife you get shot or tazed.  You don't use spray with knifes, miss and hit your partner your both dead.  Simple math.