Pass and Back
Pass moves you forward and applies a cooldown before ordinary rotation can show that profile again. Back is limited to the immediately previous profile; it is not a saved-profile list and does not cancel the cooldown.
Not interested
Not interested creates a persistent mutual exclusion from future Discovery and pre-conversation interaction. Treat it as a final decision, not as a temporary Pass.
Leaving a quiz
Ordinary navigation away from a quiz is neither Pass nor Not interested. For safety concerns, use Report or Block rather than relying on browsing controls.