Targeting Sence Question

[Demigod]

If Troll has a targeting Sence of smell and is flashed or a target is invisible to sight. Troll should be able to still "see" them with his smell, correct?
If he is trying to fight Mesketto(bad spelling of the little blood sucker)
who is not invisible but very very small then i have just the penilties to my smell PER Roll to "see" him correct?

[Steve Long]

If a troll (or other character) has a Targeting Sense (Smell or otherwise), he can use that Sense to locate a target in combat with no penalty even if his eyesight has been blinded (say, by a Flash).

If he's using a Targeting Sense (Sight or otherwise) against a very tiny creature, he suffers the appropriate difficulties to see him (bought outright or via Shrinking, depending on the situation), provided the tiny character is trying to remain unseen -- if the tiny character's right out there in the open, the PER Roll penalties from Shrinking and/or size-related bonuses to Stealth don't apply.