I was trying to come up with something both useful and unique for the Trick Arrows to make it less controllery and more defendery.

What if we replaced the Entangling Arrow with the following:
Illumination Arrow (or Marker)
Ranged, Click, Target (-Def, -Stealth)
This could have a high Def Debuff (-30 maybe?), but only last 10 seconds or so with a 20 second recharge. That would require frequent applications to maintain the single target buff, but would greatly improve the accuracy of anyone that targeted the marked enemy. As a single target debuff, it's not extremely powerful but could be quite useful against troublesome opponents.
The -stealth component is just kind of an added bonus that wouldn't have much effect through most of the game (are there any mobs other than knives with stealth?) but would be an extra feature for pvp.