It's kind of useless to just slot in some 'science'. It's like planning to do 'stuff'. What sort of experiment/tinkering/fooling around with corrosive magic/fooling around with magic/etc. do you think we should attempt?
If and when we have time for scientific testing, I'd like to explore the limitations on grief based knowledge.
That is to say, arranged from most likely to least likely:
• Can we access publicly available information in-universe that is unobtainable with metaknowledge? (This is "Grief Google".)
• Can we access private, earth-based, non-magical knowledge? (This gives us full access into basically all aspects of communications, and can be leveraged into a quasi-legal identity and unlimited funds).
• Can we access general magical knowledge? (At the very least, saves us time and lets us print Sayaka off a textbook).
• Can we access specific magical knowledge, in particular pertaining to our own abilities or Oriko's condition? (Obvious utility).
• Can we access future knowledge? ("Will this coin land heads or tails?")
I don't see any reasons that this couldn't be done in timestop, save for the obvious discomfort from witchy grief (which is something we'll need to overcome if
any testing is going to be viable in timestop), and possible interactions between timestop and precognition (but I expect to hit our limit well before then).
Beyond that, I'd like to finally determine whether lasers let us overcome our range limit, and check the obvious interaction of a 'griefbending focus' meant to aid in using our primary power the same way the harness did with melee.