The situations of "rest per block" and "one way to the Guardian Outpost" are not the same. They are, excuse me, as different as night and day... One way to the Guardian Outpost is a difficult situation, a strong block at the exit of the castle is insurmountable. So, there's no need to compare them. The fact that a strong block is not provided for in the rules is probably to prevent abuse.
I have nothing to add.
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