Pop Up Grammar is pretty much bogus and only 4%ers care about it. I haven’t done it for years. But there is Pop Up English. That is when I say to an actor, for example, “Hey, you just walked through a door.”
Using Pop Up English helps glue the story together. I go from 99% to 95% use of TL in the class. Big deal. I like Pop Up English. But if it is longer than 4 seconds, strictly enforced by the timer and the clapper (who sit near each other and work as a team), then I messed up.