Nope mostly dodge-stumbles out of the way of very angry claws, apart from them raking across his side. Clenching his teeth, breathing hard through his nose, and a grunt later, Nope is still covering his ears by virtue of not really committing any brain time to changing the fact, fingers starting to feel sore. One would think one gets used to getting hurt in this line of work, and currently, this is not the case for Nope, who finds hurting very detrimental in regards to erasing things from existence precisely. So hoping this Siren isn't just straight invincible, his brain cycles the same removal process again. At least the repetition makes it somewhat easier, but also brings the risk of stupid auto-piloting with it, and he really has to watch for his brain doing a different kind of stupid and letting in a stray thought it thinks it has some processing time left it should spend since it is just doing the same thing, and no brain, you should not!

Spoiler: Actions
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Hey, guess what...

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)[31]
Routining against the ghastlings for 25