Message of Death
Of course Zorro rolls out of the way just in time, not bad for a guy with a concussion. I wonder how may of these fight scenes were filmed with Moore or with his stunt double, since you can't see his face at all. Rita confronts Zorro in this episode, wanting to know what his motivation is. Zorro reveals his ID to Rita, and she's of course surprised.
This is the almost obligatory flashback episode, one more way to save money towards the end of the serial cycle. I don't know when this started, but sometimes it would be during the middle of the serial as well. Probably to give the filmmakers more time to get the next episode done. It's only half an episode. The villains leave dynamite for the telegraph... Next: Runaway Stagecoach