Well, we were moving together, but didn't use any pro. the slope was between 50 to 60 degrees. We heard accounts of people simul climbing using snow pickets, we also heard of people simul-soloing to the couloir. It just depends on what you are comfortable with and how much you trust your partner. The only reason we are tied together is because we just finished a rock section where we did need protection, and we didn't want to take the time to untie, but it probably would have been safer if we did untie since we didn't use any protection, but that is where trusting your partner comes in.