Apparently the Surface Book has a manual release to detach the keyboard from the base. Found this after reading through a reddit post
"Okay. On the right hand side of the clipboard about 4-6 holes up is an emergency release. You will need a paperclip and it will go in at a bit of an angle. This will disengage the keyboard manually. You may need to fiddle a bit to fully detach but it will come apart. After that, plug in the clipboard and all should be good to go.
Hope this helps. "
Surface Book detach light is red • /r/Surface
"Okay. On the right hand side of the clipboard about 4-6 holes up is an emergency release. You will need a paperclip and it will go in at a bit of an angle. This will disengage the keyboard manually. You may need to fiddle a bit to fully detach but it will come apart. After that, plug in the clipboard and all should be good to go.
Hope this helps. "
Surface Book detach light is red • /r/Surface