Does henging prevent poison from progressing?
It does.
Given that henge cannot affect the mind, does it prevent hallucinogens from taking effect or from progressing? (i.e. can you use it to prolong or sustain the effects?)
Your mind under henge is in the same state as your mind immediately before you henged. Hallucinations (whether from physical causes, neural disorder, or etc) will not terminate as long as you remain henged. You continue to think and form memories as you would in your physical body.
Do we know an underlying reason that you have to have seen the type of animal that you're trying to henge into?
You do not.
If Mari genjutsus the kids so they think they see a chakra beast that she encountered some time in the past, and they don't notice it's not real, is their belief enough? What if she makes something up?
Doesn't work. You don't know why.
@eaglejarl can you talk about what civilian travel is like, especially through national borders? How intense are the inspections we could expect, at least based on how our own nation did it?
It varies a lot. In some places it's an open-door policy, in others there are strict inspections. The level of scrutiny varies from time to time as well. Sometimes you'll get "what's your name, where are you coming from, why are you here, go on in" and sometimes you'll get people opening every bag in your cart and pawing through the contents. In wealthier places the guards might be backed up by a ninja (usually but not always a genin) who sits around looking intimidating while the civilians do the work.
If Keiko goes to the Summon realm with a bunch of explosive seals, gives them to Panda and then returns to our realm and summons panda, does he get a whole bunch of (re)usable explosive seals made of the same chakra constructs as Panda is?
Pandā comes back with some things that look like blanks for those seals but are not always perfect matches. Either way, they are not active seals.
Are there any sealing experts in the summon realm?
None that you have met.
What counterfeiting countermeasures do we know of?
Ridges on the edges of the coin, designs on the face and obverse, hole of a particular shape in the center, the fact that the Daimyo or other local authority will hire ninja to kill counterfeiters.
Question: Move the LBF relative to the earth or to the other LBF? Like if you had 2 LBFs on the opposite side of a spinning record, would they be moving but aligned?
Also, do LBFs have to have their flat sides facing each other or can the chakra beam go from on thin edge to the other, just over the surface of a paper? Or can the beam be made to fire in any direction(180 degrees) from the paper?
Kagome hasn't tried moving the seals. The beam always comes out normal to the center of the seal and must strike normal to the center of the other seal. Before you ask, curving the seals has unpredictable results.
e: Added to the PK doc, but:
@eaglejarl @Velorien @OliWhail What're the numbers as far as we (read: Kei) know on the number of bloodline ninja as compared to non-bloodline ninja?
Clans with bloodlines have a survival advantage over non-bloodline ninja, both in straightforward terms and because clans offer an economic, political, and educational powerbase that other ninja lack. Roughly 20% of ninja have a bloodline, although some are fairly trivial.
@OliWhail @eaglejarl @Velorien Question on how skywalkers work. Do they provide the +20 dice when dodging explosives?
Dodging explosives is a matter of reflexes and speed to leave the area in time, and ninja can already do that without needing to move in extra directions. Skywalkers do not provide their bonus for escaping explosions.