Brightshield has an upgrade that puts her and all friendly models adjacent to her on guard.
How does this work? Is it like a pulse, putting them on guard, then if the friendly units step away from her they keep their on guard status (losing it if they charge away, as normal)?
Or is it always active like an aura, but only while they are adjacent to her (so if they step away, they lose it)?
And does Brightshield have permanent on guard status as long as she is upgraded, or does it just activate like a normal activation and she can lose it again like normal?