I tried to help a friend with MR9 but the detection range has grown huge in the past few weeks (perhaps Gauss update). I ran my test 3 weeks ago easy, I basically crouch hid top of the columns when encroached. This does not work any more, grineers pick you out even high, across the map. It seems guards, especially in phase 3, have extreme detection range even while crouching. Here is a vid of phase 3 guards detecting after jumping back to phase 2 area and crouching. https://youtu.be/