Game Mechanics: NPC Summon Isssue

[Treats]

I encountered a similar issue to this a long time ago, not sure if it was ever fixed.

As Tecmos said an NPC will not alter targets if one PC is standing around a corner and another PC is closer but in Line of Sight.

NPC should first check Line of Sight when rooted
If it cannot see closest PC it should keep checking until it has a PC in Line of Sight

The other issue I found (this was back in 2010) was that if a PC target was out of Line of Sight the NPC would not be able to cast any spells. An NPC that could heal himself when he got low would not if his target PC was out of Line of Sight.

Fight Shaman NPC
Root/DoT Shaman NPC at 40%
Run around corner
Shaman NPC will not attempt to cast ANY spells (Detrimental or Beneficial) while his PC target is out of Line of Sight