Sensei tells Cam he's traced the essence of Tori and Dustin to an abandoned factory. Cam understands and immediately runs out. Since he'd just freed himself from being tied up and gaged in a closet all day (out of earshot, one would think, since he never attempted to call out), he couldn't have known what's been going on or what his father meant by "essence" (or which abandoned factory he's running to, for that matter).
When Shane uncorks Fragra's perfume bottles, the regular people she converted into perform transport back to the locations where they were changed before returning to normal, but when Tori and Dustin are uncorked, they return to normal then and there and do not transport back to their transformation location like the rest. The rules on how things work are not consistent.
As perfume, Tori and Dustin call to Shane for rescue from their bottles. None of the other people-turned-perfume call out for help, and only Sensei Guinea Pig has ever demonstrated any telepathic ability.