ATGM - opportunity fire

[Pfor]

I have noticed that when an opposing ATGM opportunity fires at one of my units, the screen focus may shift to another part of the map and a hex will be red-lined with a target path shown (presumably back to my unit). If I were to slow down animation preferences, I guess I could memorize the terrain and 'find' the pesky critter. There is no trace of him after the Opfire is finished.

I was wondering whether this is another ingenious in-game signature unique to ATGMs, or purely unintentional.