Press to the wall and flight.

[Avadriel]

Press to the wall (combat feat) allows you to treat an impassible object as a flanking buddy.
1) If you are flying, does this allow you to flank with the floor?

2) Does it allow you to flank the floor if you are benefiting from high ground?

3) Does it benefit from flanking teamwork feats since you are flanking with your self? or do they not apply because the wall does not have those feats?

4) what if the person you are trying to use it on only thinks there is an impassible object behind them such as a silent image wall?

5) Does a pit of lava or a cliff count as impassible terrain and allow the flanking?

[Maezer]

1) RAW, yes I think floor counts as a solid, immovable object that occupies a square. RAI, I have my doubts, so I'd expect funny looks even if technically right.

2) If by higher ground, you mean you actually occupy the square above your opponent, then yes it should work. Simply being on a mount larger than you opponent doesn't guarantee this though as the ground would not actually be in a flanking position.

3) No. The square opposing square is your ally not yourself. If you have something that grants a teamwork feet to your allies... it probably works by RAW but I'd expect more funny looks.

4) No. The object needs to be solid not just seem so.

5) No. Assuming for cliff you mean, empty space (ie force them off the top to fall) as opposed to a big wall at their back. Lava isn't solid pretty much by definition.

[Kayerloth]

1) Yes, assuming you are flying overhead in such a manner as to draw the line through opposite sides of the space/cube.
2) No, not flanking unless you were on an overhang or similar area where you could draw a line between the centers of the spaces.
3) Not familiar enough currently with the teamwork feats.
4) Hmmm, I'd say Yes but might grant your foe a save since your foe and you are definitely interacting with the Image at that point (and if playing with any sort of critical hit/fumble homerules ... )
5) No strictly speaking by RAW that's not a solid barrier. Yes if the terrain is impassable (potentially deadly/very harmful - a judgement call by the GM) then I don't really care if it's a fall from extreme height or taking a fiery bath in lava or literally impassable. If your opponent would or could not voluntarily enter the area due to its lethality or material then I'd probably allow the feat to apply ... this very much enters GM judgement call territory and not RAW. Similarly if the foe was incorporeal or had earthglide (vs wall/floor) then that would nullify the use of the feat since it is no longer impassable or a lethal 'barrier' to the foe. Likewise flight might nullify the feat vs a cliff or over lava etc. etc..

[Ascalaphus]

Avadriel wrote:

Press to the wall (combat feat) allows you to treat an impassible object as a flanking buddy.

1) If you are flying, does this allow you to flank with the floor?

It's a bit odd, because I'm not entirely sure the floor "occupies a square". PF looks 3D, but the rules more closely resemble 2D. That said, I'd allow it.

Avadriel wrote:

2) Does it allow you to flank the floor if you are benefiting from high ground?

Usually not, because the line drawn from the center of your square to the center of the opposing square won't pass through opposing edges or corners of the enemy's square. Take a look at the examples on flanking in the CRB.

Avadriel wrote:

3) Does it benefit from flanking teamwork feats since you are flanking with your self? or do they not apply because the wall does not have those feats?

The wall doesn't have feats. An inquisitor could use Solo Tactics however, since the wall counts as an ally and an inquisitor can pretend his allies have teamwork feats.

That's actually pretty cool.

Avadriel wrote:

4) what if the person you are trying to use it on only thinks there is an impassible object behind them such as a silent image wall?

I would require the illusion to be a tangible one, so that an enemy backing away from you would feel himself bumping into it, stopping him from getting away.

Avadriel wrote:

5) Does a pit of lava or a cliff count as impassible terrain and allow the flanking?

I'd allow it in a home game. The feat's fluff line tells us that you get an advantage if an enemy can't get away from you. If he's unwilling to step into the lava/off the cliff, then the flavor of the feat applies.

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Cool feat by the way.