IPhone4S fell out of back pocket, down stairs, and the screen is black

I have a lifeproof case on it, so the phone didn't break or anything, but this is what happened:
I was going up my stairs and my iphone fell out of my back pocket and it fell down a good 5 stairs all the way to the bottom. I was listening to music too when it fell (it was playing from the phone, no ear buds, I was cleaning the house and it passed the time) and when I picked it up and pressed the home button, the music was still playing but the screen went black.
Then I shut it off by holding down the power button for 5 seconds and just slid the area where you would to shut it off and the music stopped so I knew it must have worked.
I turned the iPhone back on like you normally would, and it turned on like nothing happened!
This only happened just today like 10 minutes ago. What should I do if this happens again? Just do what I did?

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