I disagree, based on the following in the SRD (my emphasis italisized):KarinsDad said:2) Keep track of where downed opponents fall. Those squares can be considered difficult terrain which means double movement through them and no 5 foot step into them.
Moving through a Square
Opponent
You can’t move through a square occupied by an opponent, unless the opponent is helpless. You can move through a square occupied by a helpless opponent without penalty. (Some creatures, particularly very large ones, may present an obstacle even when helpless. In such cases, each square you move through counts as 2 squares.)