She did not say how she knows, or even if she "knows." (This is the half-way point in the circle

)
Alice answers, "God is causing him to be able to walk on water."
In my example from the OP, it does not say, "Alice answers, '
I think God is causing him to be able to walk on water.'"
She makes a positive claim which implies that she knows. If she didn't know, she would've said so.
What is her source for that piece of knowledge? How does she know its God without investigating the man first?
It is not the process that failed, but Bob using the process who has failed.
Bob has not used the process. Bob said he doesn't know what is causing the man to be able to walk on water.
He doesn't know. Full stop.
Perhaps, in the future, he will use the process to better understand the scenario. (For example he will go ask the man some questions).
But no...we do know that it failed, because Bob says he "doesn't understand." Again, it's not the process, but Bob who has failed.
What?? He doesn't understand. Does Alice somehow understand?
How does Alice "understand" while Bob doesn't? What exactly do you think it is that Alice is understanding? Or are unproven assertions a form of "understanding"?
If Alice had said, "Zeus is causing him to be able to walk on water" would she still understand?
...The circular error here, is
in going back to a system that has no definitive answer. Doing so, seems to take two different methods:
- Going back to physics (which has nothing to offer the "no surfboard" scenario).
- Categorically refusing to consider another area of study, other than physics.
Incidentally...this is a great discussion - because it shows the contrast between Bob and Alice's approaches, as Bob's being strictly mechanical (physics) much like a doctor only considering symptoms, where as Alice's approach does not give much consideration to the symptoms, but addresses the root cause. And that is the major flaw in the physics-only approach.
What??
Alice doesn't have an approach. You haven't explained at all how Alice has approached the situation and come to the conclusion that God did it.
Physics seeks the root causes of the world around us.