Good reference, cperexprg!! That is the exact play mentioned and it says the 3, not TB.
Comicref, your reference is associated with the momemtum rule. When it doubt it was possessed in the EZ (and in the momemtum case, it was downed in the EZ). In other words, all actions are backward toward/in the EZ. I don't believe that applies here.
Bottom line forward progress is forward progress, put it on the 1/2 yd line.