If I focus a die, can I free it and reroll it later in the same turn?
The only reference I see in the rules is the following (with something similar in the faq as well):
Note: A player can focus a die only after a failed roll, and he can focus only once during each of his turns.
This, combined with the "Elder Sign: Omens" iOS game's inability to unfocus a focused die makes me feel it may be set in stone once you focus and bar you from freeing it. Is there any supporting ruling otherwise?