Maybe at 2 pounds, the laptop is so light that maybe magsafe is not effective any more.
No spinning rust hard disk, no fan.
I bet it could take a lick or two. Can't speak for the plastic or the glass screen though.
Fortunately, the thing was closed, landed on the lid, bounced off the hardwood floor, did a flip, and was no worse for the wear. If it had been onto concrete or tile, or the lid had been open, it probably would have turned out worse.
My 2012 MBP retina has this infernal magsafe2 connector that disconnects every time I try to use it on my lap, but at least it'll disconnect if you trip on the cord. Or if you try to use one of the 5 magsafe1->magsafe2 adapters I've bought that consistently fail after a few months.