re your…”Is someone daring someone else to drive the price down at end-of-day?”
No, that’s not it. To me it sounds like a limit order is put in place, with the option to buy it at the close at any price if the limit order does not work during the day.
In other words, they tried to buy at a cheaper price, but during the day it did not get cheaper, so at 4:45 “screw it, I want it anyway at any price before the end of the day.”
The buy order could be for a long position wanting it cheaper, or a buy order to close out a short position at a cheaper price. To me it looks bullish. But with the fake news media, who really knows anything these days. 🙂