It probably went beyond the game limits if it exits the cell there wouldn't be anyone to hit anyway. I must ask how long do wait? Last week I tried firing the tiny tots spread strait up into the air at Cottonwood Cove then I tried to out run the explosion. When nothing happend I came back. Looked around and thought I'd try again. BOOM!
waited literally several minutes, I was doing a long range bombardment field in Black Mountain, instead all I got was silence, and no dead bodies (trust me, with my accuracy, along with the power of Splash Damage and Demo Expert, none of them could survive) and literally lobbed 5 mini nukes in different parts, same angles. Nothing. however, when I went lower then 45 degrees, it will finally loom over somewhere and land, seeing the large tell-tale mushroom cloud and shockwave.