How to force a restart of the Surface Book.

I had my new Surface Book go into an extremely long "Please Wait" loop when switching users.  The normal hold the power button for 4 seconds did not work to shut down the computer so I could continue (thank you Microsoft - you idiot).

Searching the forum found the secret code to apparently reset or restart the computer. 

1.  Hold the Power button for 30 seconds and then,

2.  continuing to hold down power, press the volume up side of the volume button for 15 seconds.

During this procedure, about 10 seconds into step 2, the screen changed, the "SURFACE" screen appeared and soon we got back to a screen that was responsive; apparently a setting screen showing system information.  Exiting this screen was successful and the computer apparently rebooted.

Luckily this did not happen at a Client office or at a Classroom presentation as it took me a different computer and an hour to track down a solution to the problem.  I have no idea what happened or if this is a "approved" procedure.

Since Presentations was why the Book was purchased and there is no documentation that this procedure is correct or that it did not otherwise damage the computer, it likely renders the Surface Book as unusable for it's intended purpose.  I certainly do not trust it for critical presentations and hopefully the company can get its money back.  It is the second time in the week since purchased the computer went into an unrecoverable, unstoppable, out of control loop of doing something other than what we needed it to do.  The first was when it decided to install updates while we were demonstrating/testing capabilities and required a hour long call (to a thankfully very competent Microsoft support person) to fix the resulting problems.

I post this to share what I learned with a "Book" heading and solicit any other solutions to an uncooperative, unresponsive Surface Book.

It would be nice to know if this is an "approved" procedure and where it might be documented.