Well, let me tell you, it was quite a journey for Bobby Singer to be able to walk again. You see, earlier in the season, Bobby was left paralyzed after a brutal fight with a Leviathan. It was a really tough time for him, being confined to a wheelchair and unable to do the things he once could.
But then, Crowley, the King of Hell, approached Bobby with a deal. He offered to heal Bobby’s legs in exchange for his soul. Now, Bobby being the resourceful man he is, saw this as an opportunity to get back on his feet and continue fighting the good fight against all the supernatural threats out there.
So, he made the deal with Crowley, and just like that, Bobby was able to walk again. It was truly a miracle. However, as we know, deals with demons always come with a price. Bobby essentially sold his soul to Crowley, and that debt would eventually have to be paid.
Now, as for Brady, he was last seen in the previous episode. He was a close friend of Sam Winchester from their time at Stanford University. However, it was revealed that Brady was actually working for Lucifer and was involved in the whole demon blood addiction plotline.
As for Pestilence, he last appeared in the episode “Hammer of the Gods.” Pestilence is one of the Four Horsemen of the Apocalypse and is responsible for spreading disease and plague. The Winchesters and their allies were on a mission to stop the Horsemen and prevent the apocalypse from happening.
So, to summarize, Bobby was able to walk again thanks to the deal he made with Crowley. Brady was involved in the demon blood addiction storyline and Pestilence is one of the Four Horsemen of the Apocalypse. It was definitely a wild ride for Bobby, but he’s back on his feet and ready to kick some supernatural butt.