[Mobhack]

There is only one smoke layer and both players smoke goes there. That smoke layer is ordinary smoke only - there would need to be another map-sized array (and display code for that layer, and another ammo type, so yet more code and OOB stuff) for IR smoke rounds.

So the VIRSS defeating missile is one test for the one missile in question, together with a regular smoke discharger animation marking it. The smoke does not have effect on any other missile - the tank needs a second VIRSS round to defeat a following ATGM.