"There are units that can effectively go into an Overwatch like mode based on two factors.
- How you position the model
- How the models reflex trigger is set off
While in reflex mode, a model with a reflex trigger can activate abilities under certain conditions, like when an enemy model moves into line of sight or ends it's movement near or adjacent to a model. Basically a conditional trigger. When this happens, certain abilities kick in.So yes. You can have models that can guard a hallway, cover a retreat, or effectively enter overwatch over a specific lane of fire."
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