if you had played the game enough you would relize that the mongoose is extremely hard to get a splatter even when someones on no sheild, the driver doesnt hit him at all. just cause no beat down medal comes up doesnt mean it isnt a beat down. i have a picture in my file share which clearly shows the connection between the flag and the player.
"not a splatter. you are looking from a driver perspective. he would have got the splatter metal if so and he got no such thing. nice work. :)"
you are looking from passenger perspective, notice the Service tag above the drivers head, it was a splatter, and the reason that it made the melee noise is that when u melee on a mongoose you are usually hitting the vehicle or the driver