How do you avoid taking sides?

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A very good friend of ours recently had a blazing row at the local bus stop. On the other side was a man we also know well, he being a close neighbour whom we often see walking round the village. Our friend was incensed by the racist and sexist views expressed by the neighbor, and told him so in no uncertain terms - she was still furiously angry when she told us about it not long afterwards. This morning - which is several weeks later - I met the neighbour in the street and he said that he would like to talk to me about the terrible and "obscene" insults he had received at the bus stop. No names were mentioned, but there can be doubt about who he is referring to. The thing is that the neighbor (Alan) knows that we are friendly with Gwyn. So maybe he wants me to take his side and pass on his complaints to her. I have absolutely no intention of acting as his mouthpiece, and neither do I want to be seen as agreeing with his utterly despicable opinions! On the other hand, I do not want to be on bad terms with a near neighbor of very long standing whom I see almost every day and who is perfectly pleasant to me when we meet - we have had some very interesting conversations on other matters over the years. OK - so he has not actually told me what he wants me to say or do, but if my suspicions are true, this could be a very awkward situation on the brew. How should I play this?