After enough pacifistiNG, I checked scumtrons unpublished fastest 39110 TAS.
Unfortunately, a 4 frames improvement from the pacifist TAS at Stage 4-2 final bird boost fucks up a few thigs most importantly
- the slot7-6 tysons (resyncable by slashing 3-4frames later)
- the slot7 machine gun position (resyncable by slashing 1-2 frames earlier)
- the slot7 jumping girl (resyncable by jumping and slashing her)
- the slot5 turret gun which is magically killed in the previous ("Ninja Gaiden--Scumtron-39110f.fm2") TAS.
The same improvement could be applied to the published TAS probably with the same unfortunate future events.
Final note: no other pacifist trick can be applied to the run (Scumtron already uses the respawn trick cleverly where applied and delaying enemies seems to be "useless"/time loser)