I just checked the river levels - 1.70 m mid day today. That is a STOUT level that would be considered VERY high for most anglers fishing (and the river would probably be blown out colour wise) and high+ for rafting & kayaking. You would be fishing all he in close stuff. Hard/technical enough to raft/kayak at that level, let alone swim without a PFD (I Presume the angler had no PFD?) in pretty darn cold water (3-5 degrees C?). If he did indeed fall in around Allison and get swept down to Osbourne that's around 6-7 km of river or so along with going through some stout water in the Trailer Park rapids, Tamahi rapids (which have some big holes at these levels) and all the gnarly stuff from between Tamahi downstream and Osbourne. I'm hoping this person pulls through, my thoughts and prayers are with this person and their family, whomever they are.