In the reflect-reflect-average (RRA) iteration scheme a point is averaged with the product of its reflection in two constraint sets to produce the next point. It was noticed in a recent study of the bit retrieval problem that the relaxed variant of RRA, called RRR, has superior performance in the limit of zero relaxation parameter. In this limit RRR defines a continuous flow (a system of ODEs), where the flow field is formed by the difference of a pair of points on the constraint sets. The flow limit can be implemented very efficiently (event-chain dynamics) when the flow field is piecewise constant, as it is in some NP-hard feasibility problems. I hope to have results for the Latin square completion problem in time for the workshop.