I'm sure Jim will be along shortly to correct me.
I think what is happening is that let's say he's bending the tail first. So for each point on the fish's rear half, it starts out with 100% of fishbody and 0% fishbend. Then 99% fishbody and 1% fishbend. etc. So it should morph from one to the other gradually.
Then you animate the fish's front half a half-second later using the same technique.
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