Occurred on the campaign level Covenant; i raced ahead on my Warthog and jumped into a hornet while my friend was still pretty far behind. Halo had a stupid moment and thought "Oh, I can't let them get that far apart! They might die! Let me teleport the slow one!" Hilarity ensued. Ironically enough, my friend's Service Tag was H20 at the time. http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=76091095
Haha wow. Me and my friend actually did this with a mongoose on purpose, got it on that little island, and he drove it on to my hornet and i tried to take him to the third tower. Their was a barrier 50ft away from the third tower just for idiots like us
Twas good times sir. Balancing that goose on that hornet was quite the Bianca, though. @OP: I'm guessing the warthog didn't land on the Hornet?