The only image (known to me) of Lun that contextualizes him in pantomime performance, again in , is one from the collection of the British Museum,  and here he looks like an actor, not a dancer (see Illustration 3 below).In this scene, from early in the entertainment, Richard Leveridge as the Infernal Spirit tries to convince Doctor Faustus to sign a pact with the Devil to acquire magic powers.
The first is a virtuoso pirouette that carries the dancer two complete rotations in a clockwise direction (en dehors) and, moreover, the rotations are at a very controlled speed, for they are to occupy two full measures of music! This choreography makes it abundantly clear that Dupré was a consummate artist.
By 1728, on the other hand, Weaver revised his categorization of dancing styles, likely in response, if only in part, to the great popularity comic pantomime or “grotesque” entertainments had acquired.
Now he elected to classify all dancing as either serious or grotesque.
Leveridge was a singer, who in fact had just sung, or perhaps was about to sing the aria “Arise ye subtle Forms” (Furies, performed by professional dancers). Moreover, Lun is not masked, although the checkerboard pattern of his Harlequin costume is clearly visible, even if partially concealed by a long cloak that drapes over his left shoulder.
The cloak, along with his floppy, wide hat, are probably intended to project the other half of his persona: Dr. Did Lun dance in this production after he agreed to sign the pact? I will argue in what follows that John Rich/Lun could not dance, or if he could, he never did so professionally.