How do you lower weapons on halo 3 online?

[Kenny1719]

basically on halo 3, I know you can lower your weapon by clicking lb,rb, left thumbstick, down d-pad, and a for 3 seconds to lower your weapon on local playlist. I know theres a way to lower weapons on xbox live games but how do you do it??

 

[Penguin Coke]

That doesn't make any sense.