You can do this anywhere, just have your teammate go prone infront of you, get your claymore out and jump-plant it between his legs and it will go flying away somewhere. I'v had them fly over half the stage before.
By jump plant it, I mean.. do a little jump forward between his legs and plant it, kinda sounds homo.
Good Find ^ I Like These Type Of GLitches Cus If Someone Was Walking Down The Road As You Did It And It Killed Them They Would Watch The Killcam And Be Like WTF?! Lol