collision detection on Roam-e

I hope the video will show how the collision detection works.
The Roam-e is the only drone that can't land the user would have to grab it from the air all the time.

What i want to know is how dose the collision detection know when you are reaching to grab the ROAM-e with out it thinking that its an obstacle ?

Am i the only one that think that this is a really dumb design like the drone can't even land on it own and the blades are exposed.