That's pretty impressive, but I've seen a lot of crap like that in BF3.
I killed a tank while parachuting, I've hit a jet with my tank's main gun and killed it. Same with choppers. I've scared people out of their tanks when I was on foot, took it, and ran them over or shot them.
There are plenty of ways to kill people spectacularly if you're creative and willing to take a fw risks.