Halo Reach lucky kill?

Ok so I have a clip. It's a 4 second clip and i can explain what happens and if you want to see it add "iNewbie Nick" on xbox and i can send it to you. What happens is that I grab a plasma launcher in the middle of forge world in a game of big team slayer. I shoot 4 plasma stickies at a guy, the guy quickly goes into armour lock, and one and only one of the stickies luckily bounces off him and flies at a warthog on the other team with 2 people in it and kills them for the double kill. at first i didn't even realize what happened too. Do you think this is a very lucky kill?