Someone please explain why in CM?

[Soldier]

That was one smart crew. They knew that they didn't have much of a chance to fight it out with a tank, etc.. :-)
Their low velocity gun is at fault for one, it takes to long (too many shots) to zero in on the target/tank. Especially, when the target is on the move.
The halftrack's thin skin and open top, makes it also very vulnerable to an HE round"s near miss, etc..
That crew should be receiving a "commendation," for saving the halftrack for an another fight another day... :-)