Sometimes its nice to know what happens "behind the scenes".
Reference post # 6, regarding output power from the Hazard switch to the "left and right" turn signal wires.
When you activate the Hazard switch, that sends power to the left and right turn signal wires.
But in this case, your Hazard switch had no power from the Hazard relay (due to the blown fuse). Your 4-ways did not work.....!
When you activate the turn signal switch, power from the turn signal relay goes through the turn signal switch to the left OR right turn signal wire. Actually in this case to both left and right turn signal wires (because you have the Hazard switch activated).
Yep, your Hazard lights worked....!!
However, Redwing52 already knew this.....!
He is a GREAT diagnostician..........!