This resident case shows the problem of fluidic surge: when the inflow of fluid into the eye is mismatched (for even a fraction of a second) to the outflow of fluid, there will be surge. You will notice a quick shallowing of the anterior chamber, the iris will constrict and then snap back, and the posterior capsule will come forwards. This is a recipe for disaster if the posterior capsule touches the phaco probe tip. Think about it, what are the possible causes for surge in this situation?
To learn about phaco fundamentals and how to choose appropriate phaco machine settings, please review this series on CataractCoach: https://cataractcoach.com/category/phaco-fundamentals/
click to learn about fluidic surge so that you can recognize it and resolve it quickly:
It looks like the resident also pulls the irrigation ports into the incision on occasion which would reduce inflow.
Great point! Thanks for the comment Bill.