In the movie The Mortal Instruments: City of Bones, on the latter part, when Jace and Clary fight against their father(Valentine), they manage to submerge him to the portal but manages to return on the same side. On the other hand, when Clary submerge herself to the portal, she came to Luke Garroway and never returned to the portal. Now, when Hodge Starkweather got the cup from Clary, Valentine suddenly appear to the portal. My question is:where do Valentine came from before he got the cup? Is there another portal on where he came from?
Note that I don't have the book to justify my question. This is based on pure observation.