They both deserve to be nerfed.
I shouldn't be kicked out of a firefight for 12-14 seconds because your Firebolt grenade landed in the same timezone as me. (I'm fine with the damage, I want it to happen [u]faster[/u])
Smoke nade shouldn't take away radar or jump, nor should it slow by that much. The Nightstalker grenades are awful by themselves.
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Nightstalker nades' are bad by themselves but so is firebolt without the two perks actuve. I think both are balanced by drawbacks.