PJSlavner said:OOC: Being exhausted reduces speed to half, but that is not the same as being hampered by difficult terrain or darkness (page 144). It seems that a 5-foot step is OK.
For future reference, the ROTG article on movement states that there are no free 5-foot steps when movement is hampered, when movement is reduced to half speed, or when the current speed is five feet or less.