[quote=@Gun]
I'm assuming that's me you're talking to. Though I'm not fully understanding your question. Care to try and rephrase? 
[/quote]

Now that I am home I can look through your posts to potentially clarify myself, but in case not my question was along the lines of, 

"If I can't be interrupted, could my character spot an awesome location for cover across an open field, so in my post I say they dart across the field and reach that location, ducking behind cover." 

Your character could attack me or move around themselves, of course, but it seems like they couldn't actually do anything to stop me from reaching the awesome location. Of course I'd have to be a jerk to exploit this and other situations along this concept in every post, but this is what I worry for doing ranked battles with this system.

This system you have reminds me of checkmating in chess from my understanding, where you have to be able to kill them if they stay still or move. I'll explain more once I get a better understanding by reading through the argument.

EDIT #1: Interrupts could get kind of zany with interrupts for interrupts, even, although I haven't personally come across anything further than single interrupts on their own and they have made sense. Guess it depends on personal experience what people see as or has become a problem. Personally I wouldn't mind 100 interrupts in a long chain as long as it made sense and was reasonably executed. There comes to a point where reaction time wouldn't allow it to go any further, though.

EDIT #2: Read everything, and it looks like my concern still stands. Only one attack is allowed, which is good for this system, but I'm not sure about running around to your hearts content. I'm guessing a prep would count as the one attack or else you could obviously charge up a massive beam and then fire it and they couldn't stop you. Some of the problems would, therefore, be solved by way of character powers not being unfair to take advantage of the system, which is a problem for any system.

EDIT: 3: Like checkmate because if I start an action you cannot interrupt me until it's done, so I'd only be killed if I was already going to be killed even doing said action. You cannot suddenly pull out a gun and kill me while I'm doing something so I'd be safe for sure as long as mechanisms for my death are not already in motion.