If a person has one Rabbi to whom they ask all of their questions, and that person is unreachable, for whatever reason, and an urgent, time-sensitive question arises, what should their course of action be? Are there any criteria for determining who to ask in that situation?
Assuming they do ask someone else, and receive a psak, should they ask their Rabbi when he returns to know what to do in the future, or is the psak they received now binding for them?