The cognoscenti know that shadows and silhouettes represent different things.

A shadow represents the consequence of current actions.
Silhouettes represent possible futures. And then there are portals!
With one world on this side of the portal and another world on that side,
a portal speaks of moving from one state of being to another state of being.
When the wizard saw these silhouettes at the edge of a portal, he had to snap it.
I asked him if I could put it in the rabbit hole for you and he said yes, of course. – Indy