If you are going to root a device, and especially if you are going to install a custom recovery and custom roms it is always a good idea to have a safety net. You can get out of pretty much any bind on a Samsung device if you have Odin on your PC and a stock image. If you ever brick your phone or send it into a bootloop flashing the stock image to recover the phone is super easy thanks to ODIN. Grab the stock file for the S6 and the instructions for installing it at the link below.
via XDA