I know they're rising from the ground, but there was no indication of any kind of attack prior to "Wham! Gotcha!" (apart from his general Zod moment, which isn't a part of the attack). From what I gathered in the previous discussion, an attack that has no transmission time or sensory indicator isn't really allowed, especially when there are no requirements that must be met in order to initiate said attack. Put another way, if Adrian can summon chains dozens of feet away from himself in the blink of an eye with no warning or projectile, what's to stop him from doing it with spikes? Or from spawning the spikes already inside his opponent? 

With Arthur, the limitations I put on his electrical constructs are two-fold. First, he can't generate more than one cubic meter's worth of volume, and secondly, all his constructs have to originate from his body. The second restriction eliminates the possibility of the above scenario being used to insta-kill an opponent (since without that restriction, he would technically be capable of doing that).

Edit: It was a charged attack, but that's not the issue I'm trying to address. The fact that it was charged is perfectly fine. It's the manner in which it was carried out that is iffy.