This is a problem I've faced several times and I've never really found a good answer for it. I think it's a fairly common thing to happen; the action is rising to a climax, lots of things are going on, and then suddenly multiple things happen in the same instant. The problem is whenever I try to write a scene like this it's inevitably clunky and awkward. I try things like "and just then several things happened" or "in the blink of an eye, everyone made their move". But when I try this approach I just end up listing the actions and the tension I've built up is kind of lost. I'd like a way to sum up all the actions quickly so the climax comes to more of a point, or a way to focus in on one action and then go back and describe what else happened at that moment. Any help is appreciated!