I want to preface this with the following: I have not yet done any normal modes in patch 5.0 or 5.2, let alone done heroic modes.
That said: Stone Guard hc has the added mechanic that you must light up tiles around the room by clicking an object and running over them. This is usually done by hunters or other mobile ranged DPS.
My question has come to me after watching the Method 25 hc kill (http://youtu.be/wcAs56A2V3c?t=3m22s). At a certain point in the clip, Method's camera Combat Rogue and Method's tile Hunter were chained together. I noticed that during this time, the Rogue was just trying to stay as close as possible to the Hunter, and didn't light up any tiles, even though he often was able to.
If someone finds themselves in a similar situation, where they're chained to the tile lighter, is there any mechanic that prevents them from clicking on the other object and assisting the tile lighter within reason? It's what I would do, at least.