swap horses in midstream, To. To change leaders at the height of a crisis. Abraham Lincoln, in an address of 9 June 1864, referring to the fact that his fellow Republicans had renominated him for President, even though many were dissatisfied with his conduct of the Civil War (1861-5) said that the Convention had concluded ‘that it is best not to swap horses while crossing the river’.
Not so much horses around here as penguins and superheroes. One minute I’m doing penguins, then a superhero comes along and demands my attention. What’s a writer to do?