Imminent is a word with a specific definition. 50 people on your property, yelling, shouting, cursing, even threatening is not an imminent danger, even if the crowd was armed. There is plenty of video. If you can show me where you think blowing someone, or a bunch of someones, away would have been justified, we can talk about it, but it's imminent threat of serious bodily injury or death, not bad things might happen if you don't do something. Or, big crowds are scary kind of stuff.