Well things are a little complicated when it comes to that capture. That would be David with Quentin's ghost in 1969 - but it's 1897's Jamison who's dreaming about them. It comes from the June 3rd's installment of the History Slideshow:
(http://www.dsboards.com/eventimages/0603ds_5.jpg)
1969: Ep #767 - ...in the dream Quentin revealed to David
three things that happened before Quentin's death.