KMST 1.2.410 - Skill Changes

Assassinate Points were officially renamed to Killing Points (kp). Assassinate no longer generates Killing Points. It uses 5 Killing Points to do 2.5x damage. Going by the description, it cannot use less than 5.
Shadow Instinct now gives Killing Points passively whenever you attack enemies at some unmentioned rate. Could be 100%, could be something really low. It appears to be the only other skill to now use Killing Points since any mention from other skill's descriptions (Meso Explosion, Boomerang Step) was removed. You gain 6 Weapon ATT for each Killing Point you have when you use Shadow Instinct.

Mmm, by what you are saying and the fact that Shadow Instinct only lasts up to one minute now, does this mean that we only have up to 60 seconds to charge up Assassinate?
This would explain the low duration time of Shadower Instinct I suppose, although I still think 60 seconds is a very low duration regardless of the Killing Point success rate, which as you said is unknown. Would the extra attack of Shadower Instinct be calculated at the moment of casting or does it change every time you get a new kp. If the extra attack is calculated each time a kp is gained or used, then every time we use Assassinate and it brings the kp back to 0, our attack would automatically decrease, so it would be better to use it right before the 60 seconds are up I suppose.
My guess is that you don't know the answer to this but it doesn't hurt to ask so, do the Killing Points go away after each Assassinate?