A moment doesn't need anything more than itself. Two moments confuse each other when brought together.
Every moment counts in improv. As improvising actors, we have to be aware that we are constantly letting moments remain unnoticed. But worse is when we start bringing in moments (ideas, story lines, jokes, ...) from off stage onto the stage.
We need to be fully present and 100% alert to everything that is going on and around our stage. This is called being in a soft focus.
Razowsky compared a moment with a glass filled to the rim with water. When you bring two of these glasses against each other, they will immediately spill their contents and the water gets mixed up. This is what happens when two moments are brought together, you sacrifice clarity.