It was a situation of blind cat meeting a dead mouse.
The reserve tanker's drivers are not very experienced, so he set the shell's path a little high, listening to his seniors. At the same time, the bear which they thought was chasing them angrily suddenly increased in speed, and jumped up at Nell's jeep. The bear would have fallen on the jeep flattening them, but the shell hit the bear.
The shell penetrated the bear, but it did not kill it.
Instead, the momentum of the shell took the bear out flying all the way to a hundred meters from the other tankers which are ready to fire.
Nell's alert eyes fell on the tanker in front of them.
It's a very plausible situation that the guys in that tanker were given orders to ignore their lives if the situation could support it even a little bit.
Nell, like all soldiers, is willing to die for the country and fellow soldiers, but not to a conspiracy.