Hiya
A very sad and terrifying incident and completely unnecessary. I hope those who survided go on to make full recoveries.
I just wanted to add about the people who lay down and played dead - in that situation, there's nothing to be ashamed of and indeed as pointed out, a natural instinctive reaction. When it comes to the rest of us, I also agree that in that situation I'd hope to be brave and try to somehow stop the situation just as the guy did trying to protect his wife, the lady who tried to stop him re-loading and the one who went in the direction of fire to help.
I've been in a situation where I've been trained to behave/do things in a certain way and in the heat of the moment, I've done EXACTLY the opposite. Thankfully, each of those incidences worked out well in the end, and although I wasn't in any immediate danger to my life, quite a few were fairly stressful to deal with (Major Fire, Intruders, Chemical incidents - and all being first on scene)
Stressful and potentially dangerous incidents like these and you really don't know how you or others will react and all respect to the people here who did what they did.
DtM! West London & Slough UK