Exactly, that tradition was built on moments like this. Just like players or units get nicknames, moments get those as well. When you talk about a specific play in the 60's, 70's, 80's, 90's, or 2000's you just gonna explain the whole play or if you say "2nd and 26" everyone will know? Pretty sure you use "Bear" a lot to notate a figure in Alabama history, so 4th and 31 is no different to me.