Hm, interesting. Got any links? I'd like to learn about that. Also, I did not know grenade types were limited to classes. I hope it does work as a smoke grenade, would be really nice to bypass turrets if a friendly Op throws one down long enough to run past in and eventually hack it :ninja:
The grenades are Class-specific abilites. Soldier gets Molotov Cocktails
and there was an offical picture of a flash bang, but that may have been removed, Medic gets Lazarus grenades
(but only at maximum level) that revive everyone, Operative gets Caltrop grenades, Sticky grenades
and I've heard a few things about an EMP grenade agaisnt sentries, and Engineers get mines, which can be upgraded into napalm mines.
I can't remember a link off the top of my head, I'm afraid. The majority of it is littered around offical videos and the website's class pictures.
Now that I've looked around, It's more than likely the Caltrop grenades are just caltrops and no smoke. EVERYTHING I KNOW IS A LIIIIIE