>>242537If you have runners then simulclimbing is fine. You don't even need to sling stuff in a lot of cases, just walk around the uphill side of a boulder or whatever. It doesn't take much technical knowledge, just use common sense and imagine what would happen if someone fell at each moment. If there is nothing to stop them dragging you down with them, then get rid of the rope. You will never arrest a two man fall.
>>242543Shortroping on moderate terrain (ie not just for glacier crossing) is often used by guides to give their client a bit of a psychological boost, and for setting up belays quickly. In theory they can also prevent a fall if they keep the rope tight, but they need to be in a position to see this happening.
Simply being roped up to someone else gives you no innate security though. Once someone starts sliding that's it, there is close to zero chance of stopping it, even if you could have otherwise arrested yourself. People die this way every year, including guides being pulled over by clients.
