Atlantean Syndra E Indicator Live vs PBE
I really don't think the arrows should be something to worry about as long as they appear. I don't appreciate the arrows as much because as a Syndra main I've hardly noticed them especially since they introduced them. I'm suspecting the change from blue to black is for clarity reasons but who knows if this is a bug or not.
The arrows themselves aren't an aesthetic part of the skin to warrant any specific color change to be honest since they are just there to help the new players adjust to her kit much easier and faster than those who spent more time practicing her combos in the past. Despite the black indicator standing out more than the blue, it's kinda distracting from a point of view. The more I use the skin, the more eye-jarring it is.
TL;DR: Atlantean Skin in 5.3 Live E indicator is Blue; in 5.4 PBE E indicator is black. Black hurts my eyes for some reason, gathering input from others.