How to perform this action of creating new edges from verts (video included) https://www.youtube.com/watch?v=_LnYG5V4ULA&amp;list=PLkzE48dEJCB1T9WC7slXaQ6yyfhzuU4lN&amp;index=13&amp;t=0s
At 0.13 seconds in (please watch at 0.25 speed) He selects verts along a vertical edgeloop, then selects a vert on an intersecting horizontal edgeloop and somehow creates a new set of verts parallel to the selected vertical vertices, from the last selected vert (on the horizontal edgeloop)
What is the tool/term/shortcut for this, please?
He has enabled the Snapping option (Vertex mode) and the Auto Merge option (top right of the 3D view &gt; Options), then he selects the edge:

He extrudes and point out the vertex he wants to snap to:

And it snaps: