It seems a lot of people don't realize `bash`, `sh`, `zsh` etc... are executable binaries just like any other on the system, and that you don't need to be logged in to a bash shell to run bash scripts.
This isn't the case for sourced scripts. Running a script in bash from fish that changes your current directory will do one of two things: It'll move you to that directory but inside of a bash shell, or it will move you to that directory in a bash shell, bash's cd will return, and you'll be in the same directory as before, still in the fish shell.
