Hello,
First time poster long time reader. Hope to write it as clear as possible.
EAREE
EBAEE
EMEEE
E = empty square
A = adjacent character
R = character medium sized with reach weapon
M = moving character toward B
B = empty square and final destination of M
Does M have cover and, therefore, not AoO is made during his move action?
A|B
A and B = Hostile characters in a corridor
| = door splitting the 1,5 f corridor
Can A and B open and close the door each round despite their adjacency to the door?