didn't say was a hoax it just look fishy. I figured it wasn't a grenade the minute I watched the footage. If you watch it carefully you'll see that the player makes an underhand throw and it hits the top of the board and roll over. Then boom mini explosion. Watch it again.
I watched it closely... even wrote an article about it elsewhere
We see the object disappear about the area of the top of the board, we don't actually see it go over. We have to look at the totality of the circumstances, we know the player picked up an object, toss it and an explosion took place. Likely the object "disappears" against the backdrop of the advertising board and lands at the base, rather than going over the board. The player who tossed it has a much more subdued reaction to the explosion than everyone else... everyone else was taken by greater surprise than he did. This indicates a link in his mind to the object he tossed and the explosion.
Observer, firecrackers come in a variety of sizes/potencies. I can't say conclusively that it was a firecracker, but it was no grenade. Shrapnel woulda kill/maim everybody in that frame. Whatever it was, I think we can both agree that it was some time of small explosive