Yes that is possibly one drawback of the completely flat screen on the Aura. If you have it in a case, that'll help.... although, the new slim style cases are so minimalist, maybe not as much protection as you'd like. I doubt anyone will be willing to test it for us though.
Glad your Aura HD is ok, I did something similar with my Kindle Keyboard, it too bounced on a hard (kitchen) floor before landing face down. I was sure it'd be a goner but it was fine.