(there was a url link here which no longer exists) - He most likely just processed it as if it was BW using D76 or something similar. Color films, regardless of processing method (E6, C41, ECN2, R4A) should all result in a nice BW image when done in most any BW developer. Some will be flat or have a lack of contrast, grainy or similar, but you get results.
When I am in doubt, esp w older films, BW is always a nice quick and safe way to see if the film works and what speed it is at due to age.
The hardest part is the development times since there aren't really nice charts like Massive Dev for the color/motion picture films. But once you nail down the timing and chems, it's all just fun shooting after.