My usual approach is to put myself in the scene as the participant whose POV I’m writing from. If you were them, what would you be thinking/feeling (emotionally)? What are your five senses doing…seeing, hearing, smelling, tasting, feeling (as in sensations)? What would you want to happen next? Possibly different from that, what are you expecting will happen next?
Now that you’ve got that bit done, go back and figure out what all the other participants are doing with those same questions. It’s less important if you’re not writing from their POV, but it can still affect things like dialogue and actions, so write anything in that might change as a result.
Lastly, re-read the whole sequence and make sure it makes sense. Then, later on, go back and re-read it. Sometimes, you know what you mean at the time, but when you read it back later on, you can’t figure out exactly who was supposed to be doing what. I know there’s been a few times where I’ve failed at that myself.