Comedy scene in Faustus

Today we read Act 1 Scene 4, which was the 'comedy' scene with Wagner and Robin. At first glance it was clear the scene was written in prose, contrasting to the blank verse that had been used consistently prior to this scene, which showed the characters conversing were of a low status. 
It may be seen as a pantomime scene, as Wagner speaks to the audience; '(to the audience) Bear witness I gave them him.' In involving the audience in such a way, that has not been done as of yet in the play, it could be a method of obtaining the audience's attention and interest. 
Humour is used extensively in the scene; 'Robin 'My soul to the devil for a a shoulder of mutton, though 'twere blood raw? (...) I need have it well roasted, and good sauce to it, if I pay so dear.' In joking over how they would sell the soul to the devil for some meat, shows a different, causal view over the matter, as we have only seen Fautus' serious interpretation of religion in this sense.
The scene is often seen as comic relief, from a serious, difficult play. I believe the scene to be ineffective as it feels out of context and out of the feel of the play, which backs up the common belief that Marlowe himself did not write this scene, and it was added as a mere afterthought to lighten the mood.