I just bought this game and I have a question that I could not find an answer for easily. In the rules it states that if you roll fewer then 4 dice you recover one fatigue for each less movement dice used. Since you have 5 movement dice why must it be 4 or less does having fatigue also reduce your movement dice like not being a full health?

"You ordinarily roll five movement dice. If there are any wound
or exhaustion counters on your Hero or any of his Allies, you
may roll no more than four movement dice." (p. 4)

Thanks, game is still fresh and it seemed weird. I did not remember the part about exhaustion and allies. I am rereading the rules now after playing a game and it is making a bit more sense now.