It's not lame at all in my opinion. At an average of $15,000 per Bitcoin, 35k Bitcoin mean $525 million of sell. In a market where most of the Bitcoins are held for long-term and only a handful of them are traded on exchanges, 35k Bitcoins sold in big chunks can create a huge effect on the market. So it did.

Otherwise too, the marketcap at any given time is not the actual USD amount invested in all the coins. It's probably less by a factor of 50 in actual value because the maretcaps are determined based on total circulating supply. The amounts shown in circulating supply is not actually circulating because most coins are stored in wallets or masternodes.

We can see Steem as an example. The 251 million Steem shown as circulating are mostly frozen in Steem Power on Steemit and many are stored as liquid Steem. The amounts available for trading represents only a portion of the circulating supply.

I hope you know this all better than me but I loved writing this comment as it solidified my learning. I can be wrong, of course, and I request correction in case so is the case.