[ oh gosh, look at the time, it's wow let's not think too hard about how easy it could be to kill by trapping opponents in a bubble shield designed to cut off airflow o'clock. thought recognised, tossed in shoebox, kicked under bed. ]

That's just it, though! [ Gestures animatedly! One might get the feeling that she's resisting the urge to bounce up onto her feet to pace. ] I could make a shield that lets breathable air permeate while filtering out something undesirable. If I can make a shield one-way, why not that? If I can use a shield to manipulate light and sound, why not that? It'd just be - okay, it'd be really, really hard, 'specially if I want something that lasts more than a minute and is sturdy enough to stand up to anything more violent than a sneeze. Hmm. [ She sits up, shuffles to sit cross-legged, and paps her hands on her knees while she thinks it through. ] You're right that suffocation could be a risk if I fucked up ... really, it'd need workshopping in a safe environment before field-testing ... [ pap pap pap go her hands -

she snatches her notebook and pen out of her hammerspace bag and starts scribbling furiously, tongue between her teeth ]