I haven't experienced this part of the game yet, but the problem here is that the line between non-combat and combat is being blurred. You want the benefits of being in combat (casting offensive spells) without the downsides (waiting for your turn, being attacked).
You're trying to do something the game wasn't designed for.
I don't think you understand the issue. That certainly doesn't describe what I want, or what is happening. What I want is something that makes sense and retains the "fun" factor. Its not fun to have a moving object on a timer that wipes my party if I can't twitch-click fast enough. The instance I describe actually changes the game mechanics. Its no longer turn based because if those things manage to get into combat... its a wipe and reload. So you HAVE to kill them first,
BEFORE COMBAT STARTS. I wouldn't need to ask for a pause to aim if this was handled differently. But I've listed several issues where pausing is required to overcome existing game mechanics.
I'm certainly not asking what you described. I'm asking for consistency. If the game is turn based, then let me have a turn before you kill me.