The bus headways were messed up today. How do I decide whether to short-turn or add a bus?

Today, due to an accident ahead, three buses on one of our routes bunched together, leaving a twenty-minute gap behind them. Someone at the dispatch center wanted to add a bus immediately, but after checking the AVL locations, passenger heat maps, and the drivers' remaining hours, I realized the peak period would be over by the time an extra bus arrived. In the end, we had one bus short-turn…