"Don't go of it"

[Superbowltrashcan]

Texted my older brother to ask a friend of his who is an NFL ref about this and he says they are told to confirm these types of decisions by repeating back what they think they have heard, especially in situations where significant crowd noise is going on. My guess is this is likely what is happening here. It is a decision that effects substitutions and the like so probably a good idea to do this.