Question about this though, how do you tell if they're low on health?
Or is it on enemies considered physically weaker?
Does it only happen on their death?
I'm just a bit confused as to the mechanics.
I just hit 'em a couple of times and then spam the capture power at them. Usually you can get a feel for how many hits a dude takes to die, just hit him one less. Its not like you "lose" the pokeballs, as long as you have the power equipped you will start the level with 10 uses or whatever. I got a bunch of idols like this. I also died a number of times trying to get idols like this, forgetting I had set the level for, like, 7.5 or something like that.
@ kevincow - Holy shit yes, they are freaking FAST. Maybe the whole point is that if you try and "open" one you get punished no matter what? Are you allowed to damage them whilst they are still closed?