It is the bit at the top of the choke. The old rocking boulder has been partially removed, and some of the rocks above it have shifted. there is a TV size boulder wedged in the rift, but above it there are a lot of small rocks and mud, but they appear to be holding up some very large rocks.
It just requires people to be careful - kicking this may well cause some movement that would be unwelcome to anyone in the choke at the time.
I went through with Henry on Monday, and it was the same as the weekend before. However, it has moved, may move again, and is after all a bloody big choke. Take care!