Nifty Animation:

This animation is composed off five separate images captured during the first drop. 

Frame 1:    0.10 sec prior to the drop
Frame 2:    0.47 sec after the drop
Frame 3:    0.93 sec after
Frame 4:    1.17 sec after
Frame 5:    1.60 sec after

The progression from a "normal" burn to a sphere is quite evident.