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On Barracuda we were Chinese and had to retreat into our main, where we fortified the underground bunker. We built an HMG covering the stairs entrance, and our Combat engineer laid C4 and AP Mines on the stairs. Now every time he triggered the AP mines, the HMG crashed as if hit with an incendiary.

i belive placed explosives don't colide with walls and such?

What do you mean? The AP mines were heading outwards (away from the HMG), and some ten meters away. Squadmates standing close by were not hurt. The C4 didn't have that effect.