The detector did indeed start to glow slightly, and even twice – first when the autocarriage passed by the road heading towards the well, and the second time near Mufigur.

Compares two things: 1) was the light stronger during the journey to Faris near Stalemide or now near the well; 2) does "nearby" mean that the detector is not glowing in Mufigur itself?, if not, how close was it to the hexagon?