Power serch definitely behaves as it feels at the moment.
My (very brief) test:

1) Type "robthebold", press Search. Result: "No results. Did you mean rob the bold?"
2) Type "pichlo", press Search. No results.
3) Type "robthebold", press Search. As #1.
4) Do not type anything, "robthebold" still in the entry box. Press Search again. 6 results.
5) Repeat #4, results as #1.