updating my vote
SCIENCE!
[X] "1 sec...I need to look at something."
[X] Stop...there's more to do here.
-[X] Examine the interaction of the magic and grief. We've always used them seperately...how is the Witch intertwining them?
--[X] Ask Mami and Homura what they make of it....what do the magical aspects look like to them?
-[X] Try replicating the barrier's properties on a very small scale...use it as a model to work from, until you can get it right.
[X] Create an atomic clock from grief, leave it outside.
[X] Once we're inside...
-[X] Create another atomic clock.
-[X] Try altering the nature of elements of the Barrier, like we do with our own Witch-Grief.
-[X] Grab a familiar. Lock it in a grief cage to keep it from fighting back, but don't directly alter it.
--[X] Have Homura Time Stop if things are looking dangerous.
--[X] Begin dissection. Start by analyzing its general structure...
---[X] Does this thing have a core? A soul fragment, or something like it, that controls the rest?
---[X] Is this pure Grief, or is their Magic involved, too?
---[X] Try to find whatever gives it intelligence. Whether that's a core, or something else.
-----[X] See if you can figure out how it's behavior is dictated...if you can make sense of it, try modifying its programming so that it will obey and/or help us, rather than the Witch.
--[X] If you have any luck with this, try making one of your own...use this one as a template, but use your own Grief and/or Magic. Make sure it's loyal to us and obedient.
after SCIENCE! or if we cannot science at the time:
-[X] Tell Mami and Homura to hold back for abit. You want to try something.
-[X] Examine a familiar using both magic and grief sense. See what it's made of, what lets it act independently, and if there's anything resembling the core you found inside a grief seed.
-[X] If possible, try and wrench control of the familiar from the witch.
[X] Encourage Mami and Homura to experiment with their powers. Especially Homura, some magic attacks wouldn't go amiss
[X] As usual, abort and go into full blender mode if things start looking risky.
[X] Feel free to show off abit when dealing with the witch. Create a large flaming blade or bombard it with disintegration rays, that sort of thing.
cause if we can't science at all might as well learn something from destroying the witch.