odd question about siege weapons.

[Berserker1]

I have been modding, today I wanted to make catapults not disapear when they hit the ground... It worked! But, when they hit units, they just sit in the air... Why dont they go through the units, and just stick to the ground? In export_description_units, the siege capapult has the attribute of body-piercing, but why dont the projectiles actually do that? They stop as soon as they hit a single unit. Not sure if anyone can really answer this... But, it is worth a try

edit: Arrows dont dissapear right when they hit the ground, but they dont appear on units they hit...
edit2: ,,l,,__(o-O)__,,l,, no one even gave input, I figured it out on my own...