Yes, that was the precise manipulation which they orchestrated.  They pumped the AMP price in order to artificially set the ICO price and right after the ICO ended, they dumped their AMPs right before the ICO AMPs are due to be released while throwing investors under the bus and cashing out both from the "donations" and their dump.  It's pretty clever what they did.  As soon as the new AMPs are released to the donators, its a simple law of economics, more supply and less demand means the price is going to further crash.