Return Gren2 after it expires

[Bridget]

I was wondering if anyone knew how to return a player's gren2 after the one he throws or holds on to expires? I know there's _throwgren2, but what if the player doesn't throw? Also, what if the player doesn't throw immediately after priming? You wouldn't be able to time it properly. This is in an effort to combat spam by limiting the player to only one live grenade at a time.