What happens if you pass through a Wall of Fire in a narrow hall, a narrow hall being two walls parallel to one another for at least two space lengths and between those spaces is the Wall of Fire? So you have Featherweight, pass through the Wall of Fire; when you do so, you must take 4 damage for passing through. To negate a point of that damage, you have to move backwards. To move backwards in a narrow hall, you must pass through the Wall of Fire again. The Wall of Fire will deal you another 4 damage. To negate a point of that damage, you must go backwards and pass through the Wall of Fire again. The Wall of Fire…
This one is complicated to me. In the rosebush case you recieve the damage when you enter in the square, so you can choose the direction as attacked in your square, easy. The problem in this case: you recieve damage between squares and there isn´t any rule about it.
It opens several options and i don´t know which is correct.
Option 1: Exactly as rosebush, consider the square next to wall of fire as the source of damage (consider you recieve damage when you stop end the movement action), so you can choose direction, you can choose go throught wall of fire again (7 life into movement when cross it); in this moment the movement is doing so you cannot backtrack (crosing the wall of fire to gain more movement) so you have to leave it behind, if you become unable to move (death end) you recieve as damage as remaining movement.
Option 2: Consider you recieve damage when crosing wall of fire (consider you recieve damage in the middle of the movement action), in this moment (just in the middle of wall, so you move 1/2 square) interrupt your movement and decide in which direction want to move (right or left), then you move for free to the square next to the wall in the choosen (the 1/2 remaining movement) and keep moving the 4 squares.
Option 3: As option 2 but when you recieve damage from wall of fire you must keep moving without choose direction.
I would choose option 3 but there isn´t any official response.
Remember you can choose the movement when start moving if the damage source is your square (or a wizard or creature in it), when you start movement you can choose move to any square adjacent to you but you cannot reverse direction (in the best situation you can choose 3 ways) or open doors, if you become unable to move you recieve the damage, so if you enemy have this spell there are some spells very useful: create wall, create door, big man form, stone block, thornbush…