PowerShell Invoke-Sqlcmd switches into sqlps session

Question

I am writing a script in PowerShell ISE and I am using Invoke-Sqlcmd. After the command is executed the Powershell session switches into sqlps session (PS SQLSERVER:>) and I can

Answer 1

There was a similar question over at SuperUser today: https://superuser.com/questions/767427/stuck-in-powershell-sqlserver

You should be able to just go back to C: