this is a joke vid, so here is a more detailed explanation: since silver bullets are supposed to kill werewolves, and the group knew that they were fighting werewolves, I think it would have made sense for them to keep the silver bullets (and possibly find a gun to use with them) to defend themselves against the werewolves that appeared later in the episode.
![](https://i.ytimg.com/vi/gmmha-RJyxc/maxresdefault.jpg)