We present an alternative theoretical model for a recent experiment [A. Fleischer et al., Nature Photon. 8,
543 (2014)] which used bichromatic, counter-rotating high-intensity laser pulses to probe the conservation of
spin angular momentum in high-order-harmonic generation. We separate elliptical polarizations into independent
circular fields with definite angular momentum, instead of using the expectation value of spin for each photon
in the conservation equation, and we find good agreement with the experimental results. In our description the
generation of each individual harmonic conserves spin angular momentum, in contrast to the model proposed by
Fleischer et al. Our model also correctly describes analogous processes in standard perturbative optics.