Laser Shield How Do You Avoid Damage From A Spartan Laser In Halo 3 Multiplayer?

How do you avoid Damage from a Spartan Laser in Halo 3 Multiplayer? - laser shield

Ok, I confess. I'm not always the best goal. But the other day I was playing online and someone shot him twice with a spartan laser ... ok the first time that I am a bit can be passed between the legs ... But the second time in the open chest. And do not even affect their shields ... Anyone have any ideas?