You were adding things straight from your imagination that aren't even implied in the dialogue that's spoken by Owain and Wynne; that's the problem with you trying to trash me pointing out what's actually said when your retort is basically ideas that aren't even slightly implied by anything that's said by either of the characters.
My Imagination?
No the Library was in chalk filled with things capable of killing people, note the dead templars and mages on the floor, Note we did not actually see the Tranquil in question when he was walking into the room with the barrier, therefore any statement countering that is speculation, Furthermore you leave out the bit where Owain directly stated he encountered a barrier, he didn't include a HOW or WHEN in that declaration.
._. So while you are trying to use three or so lines of dialogue as definite proof of your point here, i am merely pointing out, he was vague, we didn't see it and given how the room is arranged you can see said barrier from the other side it, you know avoiding the demons that killed every one.
Its not imagination, its speculation based upon in game evidence and perspective
there is a difference, its no more automatically false then your own notion he magically made it to the barrier unharmed and then scampered back up to the second floor with nary a scratch.