The SFX from the fight were hitting him in the face, and he turned away.
That's exactly what it was. The Samurai never fought Orochi
This was the first time Wano Samurai were fighting and killing each other.
If you look at Japanese raw, the sound near his face is the one for battle.
That's a stretch, because its also not true. The Ringo massacre occurred when Fukurokuju was with Orochi. Oden was also boiled alive and his death was being cheered on. Im not sure what the difference is between the scabbards being executed or Ringo's samurai being wiped out by Pirates/Orochi and this right now. Why would he abandon his ninja here, they are still killing each other. Only explanation is because he is doing something more important than fighting Samurauli/Pirates.
It literally looks like he's walking away to do something, not to avoid a fight. There is no change to his face as if he's uncomfortable with what he is seeing. The man was OK with fucking over wano before and has no redeemable qualities.. An SFX over his head doesn't imply anything because its simply background noise from the panel before. Im not sure why you have this line of thinking.
Also, weird take considering Hotei has no idea what the fuck hes doing and hes literally an enemy samurai too. Chances are Hotei doesnt know Orochi's alive, while Fukurokuju is aware of this, actually being his right hand man.
We've only seen Orochi's power like twice, which us very clearly a mythical zoan like Kaido or Marco, why are you even assuming we know how his power works then?