Once I shot a FS round at a player and saw it bounce
But he called himself out.
When I made it across the field I picked it up and fired it again. I got a second kill from the same round.
The first player was about 15 or 16 and the second was late 20's. I would say teenagers
"can catch the rounds" so you can "use them again". Try it next time you have a teen around.