I could see in the replay that the M3 crew had a bazooka on it.
Isn't it more viable to kill an enemy scout car 221 by decrewing your M3 and shooting the bazooka instead of chasing it with bullets?
Might be part of their risk/reward scheme. If you do that, you can't re-enter the M20 (M3 is a Half-Track) until the unit is out of combat, which in-game is considered after about 5 second after seeing the last enemy. If Grenadiers arrive to support the Scout Car, you might be forced to abandon the M20 to save the crew members, but then the Germans would capture your M20. So it'd be very high risk / high reward to hop out in combat to use the Bazooka.