Thanks for your swift responses.
The switch to
flip.find('**/+SequenceNode').node().loop(1) did the trick. I tried the BillBoard thing but I’m doing something wrong. The lookAt() then reversing hack thingy works fine though.
This is for an explosion and they are shortlived enough that if they are oriented correctly in the beginning there isn’t a an appreciable need to have the node continue to look at the camera.