Professor Helmerson explains the tempo of the sixteenth notes, which establish the tempo of the whole movement. The projection of the sound has to be 'exuberant', maintaining a melodic line between the rhythm and the sound.
Helmerson insists on keeping the tempo and remaining the same melodic line in the link to the Trio. He also advises the student to avoid rushed shifting and remarks the accuracy of the tempo in dotted eighteenth notes and sixteenth ones.