Apparently it was not so slow...
Over the last half hour I have had to frag about 70% of the coral. The flesh was simply falling off and moving rather rapidly, I could actually see it sloughing off over a few minutes.
All the other corals are doing fine, even the one I picked up on the same day. In fact the colour on the other new one is getting brighter and brighter.
Well there isn't much I can do now other than wait and... explain to my children that they "shouldn't say words like those and neither should dad..."