Why was Bob in Edski's city? Kara was raiding 1518 of course. Bob was spying for intel on how to keep Edski out of Kara's turret. The time he shot it when Edski was in it was an accident.
It was the first time he finally made it up the stairs. Below him Kara and Edski's soldiers were fighting away, but he locked the door, so no one could get in. He couldn't get it to work (not realizing it's automatic) so he was actually on it, riding it like a bull trying to pull it out of the bow. When it fired.
When it hit the castle, Bob bounced, and landed in Edski's town. No one noticed because they were all in the turret. So naturally, he brushed himself off like it was a normal day at the office, and strolled into Ed's tavern. He thought he was sweet, barkeep served him, all was well.
Then he started getting the stares… In all the commotion with the tower and the turret and the flying through the air, the label for his shorts had come out, and the handwritten, "Bob, if found, please call Kara," was exposed…