Saeviomagy said:
Personally I don't see how that's a bad thing.
Mind you, it is just one more example of how the rules differ with... well, themselves.
Exactly. Player innovation is great, but this looks like a walloping great inconsistency to me.
I've been trying to reason through the situation presented in the example, and it doesn't help that we're not told what the challenge in question is. It looks like the challenge is 'Find the Temple'.
The idea
might be to allow a form of implicit 'piggybacking' in Skill Challenges. This would mean that the first attempt to use a secondary skill would always be at Hard DC, but other one-off uses of secondary skills that built on the result of the first needn't necessarily be Hard themselves.
Case in point: the cleric uses outside-the-box thinking to see if the cultists would have built their temple near a river. That gets a Hard DC. However,
that roll having succeeded (and presumably having yielded the information that yes, they would) the fighter is then able to use Athletics to climb a tree and look for a river, which is an Easy DC.
So if this were the way it was meant to work, there would be a potential way for otherwise non-contributory characters to help. If the mages and clerics are all in a huge library doing important arcane research, they might use History (Hard DC) to come up with the title of a particular book with much of the needed information in it, and in the event of success, the fighter could use Perception (Moderate or even Easy DC) to search among the shelves for it.