If a contact opens the email again after clicking the link within, does Pipeline moves the contact back to "Opened?"

The card of the contact automatically moves to the corresponding stage based on the actions taken by the contact in response to the email. 

It remains in the stage reflecting the contact's latest action of the last campaign.

So yes, if a contact opens the email again after clicking the link within, the Pipeline will move the contact back to the "Opened" stage