I've done a lot of wire work with a Technocrane. It seems every job I do now involves at least one sequence where I'm swooping a camera around an actor or stunt person on a wire. Needless to say this can get a little hairy and requires intense focus. It also requires that you as the crane operator know where the actor is going and that the stunt guys in turn know where you are taking the camera. Now a lot of work of this kind involves a fair amount of "making it up as you go" or "rocking and rolling" as we used to call it. So while you may not be able to say exactly where the camera will be at a given point during the shot, you can agree on parameters. Look at the set. See where the wires are and any movement they may be doing. I always talk to the stunt coordinator and see where I can't go. I've been in so many freelance situations where there was a miscommunication from the 1st AD or operator that I always go right to the source and find out exactly what that actor or stuntman is doing. They will appreciate it and see that you are actually looking out for their people. Also, forget the monitor. In these situations you can't afford to take your eyes off the head. Having a pickle operator you trust is priceless. Mine have saved me from more than one unfortunate incident. Call out your moves on the headset. I'm always saying, "Swinging right," or "left and down," etc. I had an incident a while back where we had an actor travelling toward camera on a wire. We were in a hurry and losing the light and it was getting a little chaotic. The operator thought we were going to push in at the actor to simulate movement. With no rehearsal, the AD yelled. "Roll camera!" As we were about to go I saw that the stunt guys thought they were supposed to move the actor to camera. I stopped everything, went to video village and informed them that I wasn't going until I knew exactly what the stunt guys and I were doing. The DP agreed and I went out to the wire guys for a consult. Once we all knew what was happening, we rolled again and continued with the shot. Everything happened so fast, everyone thought everyone else knew the plan. In these situations, you have to step up and call a halt until everyone is up to speed. That Techno arm doesn't stop on a dime so you have to know what everyone else involved in the shot is doing and vice versa. This kind of situation can happen to anyone. The wire guys and AD department were all world class but mistakes can happen when the sun is going down and the yelling starts.
This advice actually goes for any stunt. If they are flipping a car, go to the stunt coordinator and get approval for any camera positions. If it's an explosion, go to the effects coordinator and find out the minimum safe distance for camera. If it's a gunshot, talk to the armorer. Communication saves lives.
In any case, it's been a long week. Everyone stay safe. They ARE out to get you. Not really but act as if they are. It only takes once.