With the reintroduction of the arcane orbs into the combat log, I figured I'd send you guys the Combat Log for my guilds downing of VR just now. We were doing fine until about 40% when one of the shaman hit his heroism and almost wiped us, but we somewhat recovered and was able to down him. When viewing the combat log after one of our wipes, I noticed that VR doesn't "look" at his target when he sends out his orbs. All it shows in the combat log from what I could tell, though I maybe wrong, is the aftermath (who got hit, how much, etc.)
I don't know if this would help, but a few of the guildies had Deadly Boss Mods on and if the user was near VR, they were able to get the notification of who got targeted by an arcane orb. It was hit or miss though, because I was targeted a few times during the fight, and I didn't get the icon-over-the-head notification, but when we almost wiped, VR was attacking the higher threat people (me being one of them), and when I iceblocked I got the icon-over-the-head notification when he was near me. So I don't know if for DBM if by "targeting" the icon shows up or what.