The staging of this side allows the story of the wine running out to be told: the wine will be brought to the groom.
It can be assumed that the servants bring it with a carafe and a cup, with a 3D reconstruction proposal of these items presented here.
One could also imagine that it is bread they are carrying in a two-handled basket. The gesture of the servant, extending his arm towards the groom’s back, reflects his intention to alert him to the wine shortage.
The directional interplay of the faces and hands of the servants indicates that they are passing on this bad news.
If the servant on the left carries a basket full of bread, this side could also lend itself to a symbolic parallel. In a typological reading, where correspondences are drawn between various biblical episodes, the Wedding at Cana foreshadows the Last Supper, Christ's final meal with his apostles. Bread and wine, symbolizing Christ's sacrifice, play a central role there, and could be foreshadowed here.