For once, Nope thinks he actually did a reasonable-ish job at trying to do what he wanted to do. And the Siren just shrugs it off, and is possibly even more angry at him now. Of course. He should know by now that sudden confidence is most likely based on nothing.

Wrapped in thread (and only getting a little in his mouth this time) and covering his ears against the horrible shrieking, Nope watches the ghosts gang up on the others, this seems... bad. So with his conscience already struggling, he tries to, uh, ghost KO the Siren, and even more carefully tries to somehow, maybe just kind of stop the other ghosts. Not dissolve or dispel or exorcise or ultramurder or whatever, just... ghost KO. Something. Still covering his ears and fingertips pressed against the back of his skull, he tries to make it so as all sounds briefly drop out and light is inverted before rapidly reasserting themselves (god, this keeps happening).

Spoiler: Actions
Show
Standard Attack the siren with Remove Hit Points. Damage 10 (+5/+5, Ranged) Linked Weaken Resistance 10 (+5/+5) Linked Affliction 10 (+5/+5; Impaired+Vulnerable/Disabled+Defenseless/Incapacitated; Extra Condition). Crit 16+ (if applicable), AoA -5/+5.
(1d20+15)[19]

Free Switch to Remove Hit Points, Mass

EE Standard Attack all enemies with Remove Hit Points, Mass. Damage 10 (+5/+5; Shapeable Area 2 [Limited [6"x6"x240' bendable line]], Penetrating [Pierce Immunity], Improved Critical 4, Multiattack [Single-target], Ranged). Crit 16+, AoA -5/+5.
Siren (1d20+15)[28]
Routining against the ghastlings for 25 (if they aren't minions, I'll roll 'em up in the OOC)