Found a little bit of weirdness I thought I'd share. If you [2P/4P Grenade Toss] > YRC, it's possible to YRC before the berry actually comes out, at which point you can try the toss again. But if you do this in Shotgun Stance, the grenade entirely disappears. It doesn't come out, and the timer keeps ticking down, but it won't flash or explode on you. Feels kind of like a bug. Not sure if this is actually useful but it is definitely odd.