(adsbygoogle = window.adsbygoogle || []).push({}); In the Concept Art book, it clearly says the Sentry Gun uses motion sensors to track enemy's, yet:

a) Friendlies who move in front of it are not targeted

b)Cold-Blooded means your body is incapable of producing heat, so it is understandable that Thermal and Air support, both which use Heat Sensors as targeting systems, will be countered, however, if the Sentry Gun uses a motion sensor, not a heat sensor, how come it cannot target an enemy with cold-blooded, even if they are moving in front of it?

True. It also shoots at people who arent moving.... therefore doesnt need motion?

In the Concept Art book it says on the labeled diagram of the Sentry Gun "Motion Sensor", I do not see anything to hint that it uses thermal optics to target enemies