I could have gelled the flash with a CTO filter to give the light a warm color. I guess because it was later in the evening the light had changed from a daylight color (which the flash is balanced to) to a warmer sunset color (even though it wasn't sunset yet). Warming the flash would have probably balanced the flash with the ambient light a bit better than it did bare. Being colorblind, I didn't see the problem at the time and didn't realize the imbalance until it was brought to my attention. I guess I'll know for next time.... ;-)