A similar incident happened here in middle Tennessee recently. However, the guy didn't shoot it down. He did find out where the owners lived and the owner was arrested for trespassing.
http://newschannel5.video.jrn.com/Murfreesboro-Resident-Faces-Trespassing-Charges-Over-Drone-Use-29173976
Microbursts are more common near the ground. Now a downdraft could be possible... But you would think they would have the sense to fly around a storm exceeding FL330.