Would you call the police, too?

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I just got back from dinner with friends, and on our way back to my house, we were driving down a major road when we noticed a guy walking right down the centre of the road in a very odd fashion, arms flapping, sort of stumbling and skipping at the same time. At first we thought he was dancing and being silly, but then it became apparent that he was either intoxicated or having some sort of drug trip. He dropped to the ground, rolling all over in front of the cars (we were all stopped), hitting himself and yelling. I immediately called 9-1-1, got through to dispatch and gave them my location and a brief description of what was happening. A few people had got him off to the side of the road so traffic could pass, and as we passed him he was hitting his head on the pavement, shaking his arms. There were about 4 people surrounding him, all on their phones, too, and my friends told me just to end the call to dispatch, since obviously the other people there were calling the police or 9-1-1, too. I disagreed with them, but was quiet about it. What do you think? If you encountered an accident or a bizarre situation like this would you call the police, too, even if it appeared other people were on the phone with them already?