Rounding the corner of Lefry. Past this, the risk is considerably higher as you are now beneath the northeast face of Lefroy. If it's warmed up, there will be rockfall aplenty. If you need a rest, this is the last reliable spot until the hut.
When the bus isn't running, you're going to have to walk the 11 kilometers out along the road. It's not especially challenging, just long and very tedious.