direct fire vs area fire

[GUNSLNGR]

I have question along these lines.

In an MBT game, my opponent noticed that one of his squads was down from 8 to 3 men. He played the replay and there was no "footage" of my units shooting directly at that squad. I did z-fire in that direction with both 2 MMG's and a mortar.

The only answer that I could come up with is that I scored some admittedly very lucky hits on that squad with both the mortar and/or MG's. Due to the fact that is was z-fire and out of my LOS - I never saw the unit get hit. He also didn't see it in the replay, because I didn't have LOS.

Am I completely off base here, and if so why didn't either of us see the 5 casualties?