Indeed, no news found, and the macro market is relatively calm. The price and volume pattern over the last hour is not that normally seen when long-term institutions are selling. It appears to be due to short selling hedge funds attempting to push the share price down through the $775, $770 and $765 levels in hopes of triggering cascades of stop limits set by weak longs (largely day-traders).
The strong retail and institutional longs have been holding steadily, and that may be frustrating the hedge funds. Hence they institute a raid in hopes that might earn them a few bucks. This is most easily done when trading volume is relatively light, as is the case today.
This attempt may have now bottomed as dip buyers appear to be taking advantage of the situation. Paradoxically, some of those dip buyers could be the hedge funds that initiated this little dance. Volatility is their lifeblood.
The video on manipulation is primarily for the beneifit of TMC visitors who have not previously seen it.