Wall of Stone: what counts as entrapment?

[Xexyz]

Wall of Stone wrote:

It is possible, but difficult, to trap mobile opponents within or under a wall of stone, provided the wall is shaped so it can hold the creatures. Creatures can avoid entrapment with successful Reflex saves

So what exactly are the conditions for entrapment? Full enclosure? Or am I fine as long as I shape the wall so that enemies can move out of it without breaking through. For example, can I make a Wall of Stone with the following shape without allowing my enemy a saving throw:

C = Caster
X = Wall
E = Enemy

XXXXXXXX
XCE
XXXXXXXX

Also, how high is a Wall of Stone? The spell says one 5ft square/level, so I'm assuming that each section is 5 feet high unless I double up on the sections, correct?

[Avianfoo]

It's when you pick up a nice barmaid on the corner of the street but she turns out to be in the town guard and... oh... hehe... nevermind.

[deuxhero]

You are correct on the height.

I too would like to know about the entrapment. As a GM I'd say it only applies when the trapped is adjacent to the wall itself as otherwise you run it strange things like sealing off a dead end hallway gives characters HUGE jumps

[Avianfoo]

Wall of Stone

There is no hard and fast ruling AFAIK. I would rule that the person gets to make a reflex save to choose which side of the wall they want to end up on, if they are adjacent to the wall when it is created. Though I would probably allow (at a push) a 5ft distance (or acrobatic jump distance?) between the person and the wall if they knew it was coming.

Though since the spell reads: "The wall cannot be conjured so that it occupies the same space as a creature or another object." a rules-lawyery player might want to reflex INTO the wall to effectively dispel the wall. There after meteor swarms will rain down upon his rules-lawyery head.