My guess is that was a VTOL with efficient aerodynamics or jet drone to loiter and power for racing-class activities. If it flies, something like https://fusionflight.com/jetquad/ could pull it off.
Possibilities:
0. Rich, drone expert prankster, or startup showing-off to their buddies/customers "getting away with something" highly-illegal.
1. State actor demonstrating strength, vulnerabilities, and/or doing low-level recon.
Possibilities:
0. Rich, drone expert prankster, or startup showing-off to their buddies/customers "getting away with something" highly-illegal.
1. State actor demonstrating strength, vulnerabilities, and/or doing low-level recon.
2. Terrorists scouting targets and/or probing vulnerabilities.
3. Military demonstrating vulnerabilities for civilian awareness and corrective purposes.*
4. Military seeking budget for anti-drone.*
5. Military-Industrial Complex drumming-up business for anti-drone.*
* Conspiracy theory-ish