Yep, that “salt vampire” scene did include an epic Shatner scream. Chekov seems to have a more piercing scream, though. The probe probably picked up one of those scenes where he’s strapped down to a sickbay bed, writhing in pain.
You got the salt vampire scene correct.
As I recall, all the victims had suction cup type marks on their skin like you might get from an octopus or something.