Actually, nevermind, I'll explain them now.
N3: Ace Timing performed NK, slaini reports hearing the sound. NS reports hearing slaini, and slaini reports also hearing sounds from NS, NS was targetted by doctor.
N4: ??? performed NK, NS hears sounds from slaini, slaini hears sounds from NS, slaini was targetted by doctor.
If slaini is scum, he would've sacrificed himself D4 and not brought any suspicion to Ace (Especially considering Ace Timing has more experience if I'm correct), probably taken all scumreads on Ace away in the process, and then Ace would've been protected by Doctor, and even in the case that doctor didn't target him, he would've targetted someone else, so Ace would've been unhearable. Of course, Ace didn't know for sure Amianki is a doctor, but at the same time I feel, whilst it wasn't completely obvious, it should've been guessable.