jeremy,

Where about does he do this... I dont want to watch the entire video.

Also I have never heard or extruding vertices, vertices only contain 1 set of data and thats where it is in the world. To be able to extrude, an object needs two or more points of reference (i.e 2 or more vertices). I have only ever heard of extruding edges and faces. Maybe he made a slip of the tounge...

The approach I would use this is to ignore what he is saying and copy his actions, but I am not sure of your skill set for Maya, to be able to do a copy and paste of this.