2 things I'll ask a cop for.
First, outside the context of any confrontation, I'll ask a cop how he would respond in a hypothetical situation. What good does this do? Well, maybe none, but it might help me understand what to expect should I flex certain rights, and it also might help them draw rational conclusions about certain scenarios which might lead them to making more rational decisions should those situations arise. If they don't think about it until it happens (such as a guy walking around with a shotgun on a sling) they may be more reactionary and less rational about it. If they've been posed with the situation before hand, albeit hypothetically, they may fall back to those previous thoughts on the subject that were free of emotion, adrenaline and tension.
Second, from police I know personally, I'll be glad to let them train me on tactical shooting or self defense manoeuvres. I'll take any training from them they they'll give me. Sure, some of them couldn't shoot the broad side of a barn, but some are excellent marksmen and have a lot to teach.
Sorry I didn't watch the video, but it doesn't surprise me that he wouldn't answer. Are you sure that he even knew the answer himself? I would think that it's more than just a possibility that he wasn't really trying to be a jerk, he may just have not had a clue as to the answer to the question and didn't want to look like an idiot on camera...