Click somewhere in the drawing area to create the second carbon atom
A second carbon atom has been created, bonded to the first atom.
The atom will be created along the 'bonding line', at a distance that corresponds to a normal C-C single bond distance. That is, the bond length is constrained while drawing.
The newly created atom becomes the new selection, and you are still in bonding mode. The next bond will be created to the carbon atom just created. And you are still using the C-tool.
