It was expected to hit the surface, NOT plow into it like a pile of gravel, use the blower to grab particles in the bucket, then blast backwards. Instead, it DI

It was expected to hit the surface, NOT plow into it like a pile of gravel, use the blower to grab particles in the bucket, then blast backwards. Instead, it DID plow into the asteroid like a pile of gravel, even at a slow 40cm/sec. It was thought it would be much more solid than it turned out to be. It had no way of controlling how far it went in.