a) You must have looked up too early, when her message dissapears start slapping 6 times pretty much but yea it's like 6 slaps and .3 .5 possibly if one wants to be totally accurate,(reaction time should account for this though unless you react really fast after 6th slap, wait at least until you hear the 6th slap sound) you should get the feel for it after awhile.
b) When you get Nat to protect never look in her direction until you are sure she's past the door (she needs to warp the door she's behind) so backstrafe back up and maybe even stand up there facing right a bit for like 1 sec, if you look left too fast you might randomly lose a bit of time even if she warped the door. When you see Nat has come round the corner there's no way she could be slow now if you just keep looking at her until she's down the spiral stairs, wait until she's down the spiral stairs though for consistent fast Nats.
I'm not sure if she can still be randomly slow sometimes but if doing all this correct should give you very good chances of fast Nats.
c) I have a timer running, timing is 18 flat from when she turns onto stairs btw (not when she touches stairs) this should be more consistent than timing by messages so I would recommend this. Also assuming you don't open the door for her you wanna turn away really fast right when she turns (or even before) onto the stairs, or she might not warp the door, wait near the stairs and get quickly away from the protect area right when she turns.
edit: 18sec flat ending from when she turns UP TO WHEN FADE BEGINS, I've had 17.8 twice I think and some 17.9 but yea kinda rare I guess, might wanna make it 18.2 if you really don't wanna risk it, but it's hard to time it down to the tenths anyways heh.
