I can understand where you're coming from. As a slenderblogger myself I've had difficulties with portraying action sequences. While writing lacks the ability to specifically show a moment in movement it does have the ability to use language to do so for us. I personally think it comes down to the style and feeling of the scene in question.
For instance in my blog I had a moment where my protagonist had almost lost one of the most important people in his life following a trap setup by a proxy. I'll post it here so you have some kind of idea.
"Hello everyone, I’ve received a message from #30 that he’s now across
the border and I intend to meet with him. I know that I’m suppose to
wait for this supposed “Lady of Heart” before doing anything but I just
can’t sit around doing nothing. I’ve decided not to tell Jane because I
know that she’ll worry and say I’m doing something stupid, but this is
something I have to do. I’m going to meet with him in a public place and
hopefully that’ll provide me with an out if things get a little too
suspicious. We’re going to be at this place in the city called “The
Forks”. It’s a tourist spot where two rivers meet and it’s usually
pretty busy, so I doubt anything should occur.
Here’s hoping everything turns out okay. I’ll let you all know how it turns out tomorrow."
"I have a lot to say, but my brain isn’t working right now.
I have a lot of things to process, but I don’t know where to start.
This whole ordeal is becoming too much.
So many lies.
I shouldn’t have been so careless.
I should’ve waited.
Jane almost died today…
I need a few days to figure out what to do.
I’ll find a way to make them pay…"
As you can see I spread an event over several shorter posts. And you can also notice a few things about the posts. The first post is formatted as a paragraph, so it is implied that the writer is of sound mind. Then an event occurs and you'll notice that I haven't explicitly stated what happens, instead I make a follow-up post. In the second post, sentences are separated into lines, they're not all together mirroring the writers distant mind. Even the sentences are generally disconnected. They hint at events, but never actually explain why the writer is this way until "Jane almost died today..." So now the reader knows what triggered the behaviour, and based on the following lines they can understand where their thought process is going.
Not sure if this answers your question or not, but that's one of the ways I deal with action sequences. By focusing more on the events that occur before and after instead of the event itself.