There are a couple of other possible scenarios (besides manipulation) too that could have played out. One scenario is a guy who accidentally clicks the wrong button or puts the sale in the wrong slot or price or quantity or whatever. Another scenario is a guy who stole coins and is trying to get rid of them quickly and does NOT care about price..
I was not around for previous low points between major bubbles, but people who were often speak about "capitulation", which as far as I can gather means a general loss of all hope. It might sound like a cop-out but I do feel that this didn't happen properly in April, and that it is a necessary part of the cycle. Incidentally I don't think the point of general group psychological capitulation necessarily should correlate with the lowest price, but we shall see...